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Pralatrexate プララトレキサート
Pralatrexate (JAN/USAN/INN);
10-Propargyl-10-deazaaminopterin;
Folotyn (TN)
Antineoplastic
Product
CAS:
|
FOLOTYN (Allos Therapeutics)
146464-95-1
|
---|---|
Formula |
C23H23N7O5
|
Exact mass |
477.1761
|
- (2S)-2-((4-((1RS)-1-((2,4-diaminopteridin-6-yl)methyl)but-3-ynyl)benzoyl)amino)pentanedioic acid
- (2S)-2-({4-[1-(2,4-diaminopteridin-6-yl)pent-4-yn-2-yl]benzoyl}amino)pentanedioic acid
- 10-Propargyl-10-deazaaminopterin
- N-(4-(1-((2,4-Diamino-6-pteridinyl)methyl)-3-butynyl)benzoyl)-L-glutamic acid
- PDX
- UNII:A8Q8I19Q20
Japan approved 2017
2017/7/3 | PMDA | JAPAN | Pralatrexate | Difolta | Mundipharma | NME |
EMA 2012
The molecule contains two asymmetric carbon centres (C10) and (C19). The C10 position exists in the RS-configuration (approx. 50:50 ratio) on the link between the two aryl groups. The C19 position is contained in the glutamic acid moiety and predominantly exists in the S-configuration. Pralatrexate is an off-white to yellow crystalline material, soluble in aqueous solutions at pH 6.5 or higher and practically insoluble in chloroform, and ethanol. It predominantly exists as a single polymorph (form A).
Pralatrexate, chemically known as “(2S)-2-[[4-[(1RS)-1-[(2,4-diaminopteridin-6-yl)methyl]but-3-ynyl]benzoyl- ]-amino]pentanedioic acid”, also known as “10-Propargyl-10-deazaminopterin” or “PDX”, is a compound which has been tested and found useful in the treatment of cancer. In its racemic form, 2S)-2-[[4-[(1RS)-1-[(2,4-diaminopteridin-6-yl)methyl]but-3-ynyl]benzoyl]a- mino]-pentanedioic acid has been approved by the U.S. Food and Drug Administration (FDA) as a treatment for relapsed and refractory peripheral T-cell lymphoma.
Pralatrexate, was first disclosed in Journal of Medicinal Chemistry. 36: 2228-2231 (1993) by DeGraw et al., and subsequently in U.S. Pat. No. 5,374,726 and U.S. Pat. No. 5,354,741.
Pralatrexate is an antimetabolite for the treatment of relapsed or refractory peripheral T-cell lymphoma. It is more efficiently retained in cancer cells than methotrexate. FDA approved on September 24, 2009.
Pralatrexate (brand name Folotyn) is an anti-cancer therapy.[1] It is the first drug approved as a treatment for patients with relapsed or refractory peripheral T-cell lymphoma, or PTCL[2] — a biologically diverse group of aggressive blood cancers that have a poor prognosis.[2]
Approval
Folotyn was approved by the U.S. Food and Drug Administration (FDA) in September 2009 under the FDA’s accelerated approval,[2] which allows for earlier approval of drugs that meet unmet medical needs.[3] Pralatrexate injection is marketed in the U.S. under the name Folotyn by Spectrum Pharmaceuticals.[2] Clinical trials are currently underway to explore the potential of Folotyn in other blood related cancers and solid tumors.[4]
Mechanism
Pralatrexate is an antifolate (a folate analogue metabolic inhibitor) designed to accumulate preferentially in cancer cells.[1] Based on preclinical studies, researchers believe that pralatrexate selectively enters cells expressing reduced folate carrier type 1 (RFC-1), a protein that is overexpressed on certain cancer cells compared to normal cells.[1]
Antifolates, such as pralatrexate, are part of a group of compounds known as antimetabolites with structural similarity to naturally occurring molecules involved in DNA synthesis.[5] Cancer cells mistake antimetabolites for normal metabolites[5] allowing the compound to stop or slow critical enzymes involved in DNA synthesis which then triggers cell death.[1] Because of their primary effect on DNA synthesis, the antimetabolites are most effective against actively dividing cells and are largely cell-cycle phase specific.[5]
The selectivity of pralatrexate for cancer cells is based upon the observation that cancer cells generally have an overexpression of reduced folate carrier protein-1 (RTC-1) compared to normal somatic cells. This carrier protein allows the entrance of pralatrexate into the cell. Upon entering the cell, folypolyglutamate synthase FPGS catalyzes the polyglutamination of pralatrexate so that it is retained inside the cell.
Once inside, pralatrexate competitively inhibits dihydrofolate reductase (DHFR) and thymidylate synthase. Subsequent depletion of thymidine monophosphate (TMP) occurs so that the cancer cell is unable to synthesize DNA and RNA. As a result, the cancer cell cannot proliferate and is forced to undergo apoptosis. Pralatrexate is more effective against cells that are actively dividing.
Biological Activity
Pralatrexate (Folotyn) is an antifolate, and structurally a folate analog. It acts as an inhibitor of dihydrofolate reductase. It is selective for the reduced folate carrier type 1. Its IC50 is < 300 nM in some cell lines.
Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)
Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
Animal A Km |
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
Discovery
Research on this class of drugs began in the 1950s at SRI International, where scientists were focused on developing new chemotherapies and antifolates that would be effective against tumor cells.[1]
In the late 1970s, researchers at Memorial Sloan Kettering Cancer Center discovered that cancerous cells take in natural folate through a protein identified as plasma membrane transporter (now referred to as “reduced folate carrier type 1” or “RFC-1”). Further research showed that when normal cells evolve into cancerous cells they often overproduce RFC-1 to ensure they get enough folate.[6]
A subsequent scientific collaboration was ultimately formed among SRI International, Memorial Sloan Kettering Cancer Center, and the Southern Research Institute with the intention of developing an antifolate with greater therapeutic selectivity – an agent that could be more effectively internalized into tumors (transported into the cells through RFC-1) and would be more toxic to cancer cells than normal cells.[6]
This collaboration, supported by the National Cancer Institute,[7] led to the identification of pralatrexate in the mid-1990s. Pralatrexate was later licensed to Allos Therapeutics in 2002 for further development.[8] Allos Therapeutics, Inc. was acquired by Spectrum Pharmaceuticals, Inc. on September 5, 2012. Allos is now a wholly owned subsidiary of Spectrum.[9]
Pralatrexate, is a 10-deazaaminopterin derivative which has been developed for the potential treatment of malignancies. Pralatrexate is an antifolate, structurally a folate analog inhibitor of dihydrofolate reductase (DHF ) exhibiting high affinity for reduced folate carrier- 1 (RFC- 1) and iolylpolyglutamate synthetase (FPGS). with antineoplastic and immunosuppressive activities, resulting in extensive internalization and accumulation in tumour cells. Pralatrexate selectively enters cells expressing RFC- 1. Intracellularly, this agent is highly polyglutamylated and competes for the folate binding site of DHFR, blocking tetrahydrofolate synthesis, which may result in depletion of nucleotide precursors; inhibition of DNA. RNA and protein synthesis; and apoptotic tumor cell death. Efficient intracellular polyglutamylation of pralatrexate results in higher intracellular concentrations compared to non-polyglutamylated pralatrexate, which is more readily effuxed by the MRP (multidrug resistance protein) drug efflux pump. RFC- 1, an oncofetal protein expressed at highest levels during embryonic development, may be over expressed on the cell surfaces of various cancer cell types. Pralatrexate is the first and only drug approved by the Food and Drug Administration as a treatment for relapsed or refractory peripheral T-cell lymphoma, demonstrating the ability to reduce tumor size, but not to prolong life.
Pralatrexate is a folate analog metabolic inhibitor that competitively inhibits dihydrofolate reductase. It is also a competitive inhibitor for polyglutamylation by the enzyme folylpolyglutamyl synthetase. This inhibition results in the depletion of thymidine and other biological molecules the synthesis of which depends on single carbon transfer.
US 200510267117 discloses that T cell lymphoma is treated by administering to a patient suffering from T cell lymphoma a therapeutically effective amount of IO-propargyl-10- deazaaminopterin. Remission is observed in human patients, even with drug resistant T cell lymphoma at weekly dosages levels as low as 30 mg/m2. In general, the 10-propargyl-lO- deazaaminopterin is administered in an amount of from 30 to 275 mg/m2 per dose.
US 2011/0190305 discloses diastereomers of 10-propargyl-l 0-deazaminopterin, compositions comprising optically pure diastereomers of 10-propargyl-l 0-deazaminopterin, in particular the two (R,S) diastereomers about the C 10 position, method of preparation of the diastereomers and method of treatment of conditions related to inflammatory disorders and cancer.
US005354751 discloses heteroaroyl-10-deazaaminopterins and 10-alkenyl or 10-alkynyl-lO- deazaaminopterins having pronounced anti-inflammatory activity, anti-leukemic and anti- tumorigenic activity, as well as a method for treatment of inflammatory diseases, leukemia and tumors. Pharmaceutical compositions containing these heteroaroyl-lO-deazaaminopterin compounds are also disclosed. The invention further concerns a process for preparation of these compounds. A method for preparation of I0-propargyl-10-deazaaminopterin compound is also disclosed in this document.
Journal publication Bioorganic and Medicinal Chemistry (19) 2011, page 1151, synthetic approaches to the 2009 new drugs, also discloses a method for synthesis of Pralatrexate. The method comprises alkylating dimethyl homotrephthalate with propargyl bromide in the presence of KH in THF and then with 2,4-diamino-6-(bromomethyl)pteridine hydrobromide in the presence of KH in D F to afford crude product. Subsequent hydrolysis of the diester with aqueous NaOH, followed by acidification with acetic acid to give crude carboxylic acid, followed by thermally induced decarboxylation in D SO to give 10-deazapteroic acid derivative. Activation of carboxylic acid as a mixed anhydride using t-butyl chioroformate prior to coupling with diethyl L-glutamate hydrochloride in the presence of Et3 in DMF to give lO-propargyl-IO-deaza-aminopterin diethyl ester. Finally, saponification of diethyl ester with aqueous NaOH in 2-methoxyethanol, followed by acidifying with AcOH giving Pralatrexate.
Methods of preparing Pralatrexate known in the prior art are not only complicated but preparation of Pralatrexate using the methods disclosed in the prior art also result in very high manufacturing cost. Therefore, there is a need for an improved, simple and cost effective method for preparation of Pralatrexate which can be used for industrial scale preparation of this compound.
PATENT
scheme- 1 .
Scheme-1
Scheme 2
Scheme 3
scheme 4.
https://patents.google.com/patent/WO2013164856A1/en
PATENT
https://patents.google.com/patent/WO2014016740A2/en
Pralatrexate, chemically known as “(25)-2-[[4-[(lR5)-l-[(2,4-diaminopteridin-6- yl)methyl]but-3-ynyl]benzoyl]- amino] pentanedioic acid”, also known as “10-Propargyl- 10-deazaminopterin” or “PDX”, is a compound which has been tested and found useful in the treatment of cancer. In its racemic form, 2S)-2-[[4-[(lRS)-l-[(2,4-diaminopteridin-6- yl)methyl]but-3-ynyl]benzoyl]amino]- pentanedioic acid has been approved by the U.S. Food and Drug Administration (FDA) as a treatment for relapsed and refractory peripheral T-cell lymphoma.
Pralatrexate, represented by Formula (I), was first disclosed in Journal of Medicinal Chemistry. 36: 2228-2231 (1993) by DeGraw et al., and subsequently in US 5374726 and US 5354741.
DeGraw et al, publication, US 5374726 and US 5354741 disclose method for the synthesis of Pralatrexate of Formula (I), comprising alkylation of homoterephthalic acid dimethyl ester with propargyl bromide using Potassium Hydride, which is further coupled with 2,4-diamino-6-bromomethylpteridine in presence of Potassium Hydride followed by hydrolysis in presence of NaOH in 2-methoxyethanol-water mixture and decarboxylation at high temperature in DMSO and subsequent coupling with L-glutamic acid diethyl ester using t-butyl chloroformate and a base, and finally hydrolysis of the product with NaOH in 2-methoxyethanol-water mixture to give Pralatrexate of Formula (I). The process is outlined below as synthetic Scheme- 1.
Scheme- 1
The methods disclosed in DeGraw et al., publication, US 5374726 and US 5354741 suffer from the following disadvantages, which are outlined below:
(i) Use of pyrophoric Potassium hydride in the initial alkylation step and the subsequent coupling step.
(ii) Amide formation in the penultimate step by use of a hazardous chloroformate reagent.
(iii) The final product has a purity of -95% and is contaminated with the 10- deazaminopterin impurity to the level of 4%, which affects the final quality of Active Pharmaceutical ingredient (API) and does not meet the Pharmacopeial specifications. Use of 2-methoxyethanol in the last step which is classified under guideline of International Conference on Harmonisation of Pharmaceutical for Human USE (ICH) as a Class-2 solvent, with a maximum daily exposure limit of 50 ppm. Extensive use of column chromatography during the method adding to the cost of manufacture.
(vi) Low yield of the final Pralatrexate (-5.5 %).
US 6028071 discloses a process for the preparation of Pralatrexate of Formula (I) comprising coupling of homoterephthalic acid dimethyl ester with propargyl bromide using NaH in THF, further coupling of the product with 2,4-diamino-6- bromomethylpteridine using NaH in DMF, followed by hydrolysis with a base in 2- methoxyethanol-water mixture, and decarboxylation at elevated temperatures at 115- 120°C in DMSO, and finally coupling of the product with L-glutamic acid dimethyl ester using benzotriazole-l-yloxytris(dimethylamino) phosphonium hexafluorophosphate (BOP) and triethylamine in DMF, and finally hydrolysis with NaOH in methanol-water mixture to yield Pralatrexate. The process is outlined below as synthetic Scheme-2.
3, R = CH3
4 ■■ H
Scheme-2 The process disclosed in US 6028071 suffer from the following disadvantages outlined below
(i) Use of sodium hydride in the initial alkylation step and the subsequent coupling step.
(ii) Using benzotriazole-l-yloxytris(dimethylamino) phosphonium hexafluoro phosphate (BOP) in coupling reaction that liberates Hexamethylphosphoramide (HMPA), which is carcinogenic
(iii) Extensive column chromatography during the process adding to the cost of manufacture
(iv) Quality of the API obtained by this process is only -98%.
(v) Low yield of Pralatrexate is obtained (2.06%).
(vi) In the propargylation step the ratio of oc-monopropargyl homoterephthalic acid dimethyl ester to oc-monopropargyl homoterephthalic acid dimethyl ester is not less than 75:25.
US 20110190305 relates to optically pure diastereomers of 10-propargyl-lO- deazaminopterin, in particular the two ( ,S) diastereomers about the CIO position. None of the prior art discloses a process for preparing substantially pure Pralatrexate. When the present inventors practiced the invention disclosed in US 6028071 to ascertain the purity of Pralatrexate, they found the content of individual diastereomers at the CIO position to be 50+3.66%.
Example- 11
10-Propar gyl- 10-deazaminopterin (Pralatrexate)
To aqueous NaOH (11.6 g NaOH in 472 mL DM water) and Methanol (944 mL), 10- Propargyl-10-deazaminopterin Dimethyl Ester (59.0 g) was added at 20-25°C and stirred the reaction mass for 8 hours. After completion of reaction which was monitored by HPLC, pH of the reaction mass was adjusted to 6.6 with acetic acid. Excess methanol was evaporated under reduced pressure below 40° C and DM water (1298mL) was added to the residual solution. The pH of the residual solution was adjusted to 4.5 with dilute acetic acid. The reaction mass was stirred for 30 minutes at 20-25° C and filtered the solid precipitated. The solid was furthered purified with DM water (590 mL) by stirring at 20- 25°C for 30-35 minutes. The solid was filtered and dried under vacuum at 35-40° C to give 39 g (70 %) of the title compound.
Purity: 99.56 %
Water content = 4.8 % (w/w)
*H NMR (DMSO-d6; 400MHz): δ 1.91 (m, 1H), 2.05 (m, 1H), 2.33 (t, J=7.2 Hz, 2H), 2.59 (bm, 2H), 2.78 (s, 1H), 3.14-3.20 (bm, 1H), 3.28 (dd, J=14.4 Hz & 6.4 Hz, 1H), 3.64 (quintet, J=7.2 Hz), 4.35 (bm, 1H), 6.30 (bs, 2H, NH2), 7.39 (d, J=8.0 Hz, 2H), 7.61 & 7.63 (2xbs, 2H, NH2), 7.73 (d, J=8.0Hz, 2H), 8.39 (bs, 1H), 8.50 (d, J=7.6 Hz, 1H, NH), 12.20 (bs, 2H, 2xC02H).
13C NMR (DMSO-d6; 100MHz): δ 24.84 (CH2), 25.94 (CH2), 30.46 (CH2), 39.08 (CH2), 43.05 (CH), 51.93 (CH), 72.90 (CH), 82.57 (C), 121.51 (C), 127.35 (2xCH), 127.35 (2xCH), 132.22 (C), 146.69 (C), 147.20 (C), 150.56 (CH), 154.17 (C), 162.41 (C), 162.77 (C), 166.42 & 166.46 (CONH), 173.54 (C02H), 173.94 (C02H).
MS (ES+) m/z: 478 [M+H]+.
IR (KBr, cm-1): 1540, 1557, 1639, 1704, 3300, 3420.
XRD (°2Theta; Cu): 8.47, 10.85, 12.28, 14.34, 15.00, 15.78, 18.90, 21.79, 24.20, 27.5, 28.92, 34.28.
Example- 12 discloses the preparation of Pralatrexate according to US 6028071.
Example-12
To 10-Propargyl-lO-deazaminopterin dimethyl ester (3.0 g) in methanol (181.8 mL), aqueous sodium hydroxide (0.52 g of sodium hydroxide in 13.1 mL demineralized water) was added at 20-25°C accompanied by stirring. The reaction mixture was stirred for 2h at 20-25°C, kept for further 8 hours at the same temperature and diluted with demineralized water (181.8 mL). methanol was recovered under vacuum below 40°C and the residue was left at 20-25°C for 24 hrs. The reaction was monitored by HPLC and acidified with acetic acid (7.5 mL). The solid obtained was filtered, washed with demineralized water (15 mL) and suck-dried for 2-3 hrs. The product was dried under vacuum at 50-55°C for 12 hours.
Weight : 2.5
Yield (%) : 89.2
Purity by HPLC (%) : 99.61
PATENT
Pralatrexate, (2S)-2-[[4-[(1 RS)-1-[(2,4-diaminopteridin-6-yl)methyl]but-3-ynyl]benzoyl]amino]pentandioic acid, also referred to as 10-propargyl-10-deaza-aminopterin, is an anti-cancer drug having the following formula:
Pralatrexate is approved for a treatment for patients with relapsed or refractory peripheral T-cell lymphoma. It is an antifolate and acts as an inhibitor of
dihydrofolate reductase.
[0004] Pralatrexate is disclosed in several documents such as DeGraw et al., (J. Med. Chem, 1993, 36, 2228), US 6,028,071, US 5,354,751, EP 0944389, EP 1891957 and WO 98/02163. US 6,028,071 discloses Pralatrexate and a preparation thereof, as described in the following reaction scheme:
EXAMPLES
Reference examples:
[0099] Pt-MADES (compound 5) and Pt-MADAC (compound 6) may be prepared according to procedures disclosed in US 6,028,071, example 1.
Example 1 : Decarboxylation of Pt-MADAC (compound 6)
[00100] Pt-MADAC (compound 6) (17 g, 43.3 mmol, containing 1.4% of impurity hydro-Pt-MADAC (compound 6a) according to HPLC analysis) was added to N-methyl-2-pyrrolidone (170 mL, 10 Vol.) pre-heated at 120°C. Upon dissolution of the solid, N, N-diisopropylethyl amine (5.6 mL, 32.1 mmol) was added. The reaction mixture was stirred at 120 °C for 0.5 h, then cooled down to room temperature and poured into water (1700 mL, 100 Vol.). The pH was adjusted to 4.5 by addition of aq. HCl (16% w/w). A precipitate formed and was isolated by filtration. The collected solid was dried in a drying oven at 45 °C for 18 h to provide Pt-MADEC (compound 7) as a yellow solid (14.6 g, 97% yield, purity 87.1%), containing 7.5% of Pt-lactone (compound 7b) and 1.4% of hydro-Pt-MADEC (compound 7a) according to HPLC analysis.
Example 2: Decarboxylation of Pt-MADAC (Compound 6) without use of a base
[00101] Pt-MADAC (compound 6) (2 g, 5.10 mmol, containing 1.4% of impurity hydro-Pt-MADAC (compound 6a) according to HPLC analysis) was added to N-methyl-2-pyrrolidone (20 mL, 10 Vol.) pre-heated at 120 °C. The reaction mixture was stirred at 120 °C for 1 h, then cooled down to room temperature and poured into water (200 mL, 100 Vol.). The pH was adjusted to 4.5 by addition of aq. HCl (16% w/w) and the precipitate that formed was isolated by filtration. Drying in a drying oven at 45 °C for 18 h furnished Pt-MADEC (compound 7) as a yellow solid (1.65 g, 93% yield, purity 85.8%), containing 6.9% of Pt-lactone (compound 7b) and 1.4% of hydro-Pt-MADEC (compound 7a) according to HPLC analysis.
Example 3: Purification of Pt-MADEC 7 by precipitation of the corresponding potassium salt
[00102] Pt-MADEC (compound 7) (4 g, corresponding to 9.9 mmol of product considering the residual solvent content, prepared according to example 1) was added to aqueous KOH (12.9 mmol of KOH in 40 mL of water, 10 Vol.). The solid dissolved rapidly, and after 0.5 h, the formation of a precipitate started. After 0.5 h at room temperature the reaction mixture was cooled to 0 °C. After 1 h at 0 °C, the precipitate that had formed was isolated by filtration. Drying in a drying oven at 45 °C for 18 h furnished K-Pt-MADEC (compound 11) as a pale yellow solid (2.5 g, 65% yield, purity 99.5%), containing 0.3% of K-Pt-lactone-open (compound 11b) and 0.1% of hydro-K-Pt-MADEC (compound 11a) according to HPLC analysis.
Example 4: Purification of Pt-MADEC 7 derived from Pt-MADAC containing Pt-NADAC (5%) and Pt-lactone as impurities
[00103] Pt-MADAC (compound 6) (10 g) containing 5% of impurity Pt-NADAC (compound 6c) (according to HPLC analysis) was subjected to the decarboxylation conditions described in Example 1. The isolated Pt-MADEC (compound 7) (8.7 g, 87% yield, purity 83.4%) contained 6.2% of Pt-lactone (compound 7b), 1.6% of Pt- NADEC (compound 7c) and 3.4% of unreacted Pt-NADAC (compound 6c) according to HPLC analysis.
[00104] The compound was subjected to the purification conditions described in Example 3, furnishing K-Pt-MADEC (compound 11) (5.3 g, 55% yield, purity 98.5%), containing 0.3% of K-Pt-lactone-open (compound lib), 0.88% of K-Pt-NADEC (compound 11c) and 0.18% of K-Pt-NADAC (compound 1 Id) according to HPLC analysis.
Example 5: Purification of Pt-MADEC 7 by precipitation of the corresponding sodium salt
[00105] Pt-MADEC (compound 7) (2 g, corresponding to 4.95 mmol of product considering the residual solvent content) was added to aqueous NaOH (6.44 mmol of NaOH in 20 mL of water, 10 Vol.). The solid dissolved rapidly, then after 5 minutes the formation of a precipitate started. After 0.5 h at room temperature, the reaction mixture was cooled to 0 °C. After 1 h at 0 °C the precipitate that had formed was isolated by filtration. The collected solid was then dried in a drying oven at 45 °C for 18 h to provide the Na-Pt-MADEC (compound 12) as a pale yellow solid (1.6 g, 75% yield, purity 96.6%), containing 1.8% of Na-Pt-lactone-open (compound 12b) and 0.3% of hydro-Na-Pt-MADEC (compound 12a) according to HPLC analysis.
Example 6: Purification of Pt-MADEC 7 by precipitation of the corresponding lithium salt
[00106] Pt-MADEC (compound 7) (2 g, corresponding to 4.27 mmol of product, considering the residual solvent content), was added to aqueous LiOH (5.55 mmol of LiOH, in 20 mL of water, 10 Vol.). The solid dissolved rapidly, and after 15 minutes the formation of a precipitate started. After 0.5 h at room temperature the reaction mixture was cooled to 0 °C. After 1 h at 0 °C the precipitate that had formed was isolated by filtration. The collected solid was then dried in a drying oven at 45 °C for 18 h to provide Li-Pt-MADEC (compound 13) as a pale yellow solid (1.1 g, 73% yield, purity 97.7%), containing 0.6% of Li-Pt-lactone-open (compound 13b) and 0.9% of hydro-Li-Pt-MADEC (compound 13a) according to HPLC analysis.
Example 7: Synthesis of Pt-lactone
[00107] To a suspension of Pt-MAD AC (compound 6) (12.2 g, 31.2 mmol) in acetonitrile (122 mL, 10 Vol.), copper (I) iodide (595 mg, 3.12 mmol) and N,N-diisopropylethyl amine (10.9 mL, 62.2 mmol) were added. The reaction mixture was heated to reflux and stirred at reflux for 48 h., and then cooled to room temperature. The resulting precipitate was filtered and washed with acetonitrile (24 mL, 2 Vol.). The collected solid was then dried in a drying oven at 45 °C for 18 h to provide Pt-lactone (compound 7b) as a brown solid (12.3 g, >100% yield, purity 94.1%).
Example 8: Purification of Pt-MADES by formation of the corresponding DMF solvate
[00108] Pt-MADES (compound 5) (40 g, purity 94.7%) was added to DMF (400 mL, 10 Vol.), pre-heated at 120 °C. After dissolution of the product, the reaction mixture was kept at 120°C for 0.5 h, and then cooled to room temperature. The
resulting precipitate was filtered and washed with acetone (2 x 200 mL, 2 x 5 Vol.). Drying in a drying oven at 45 °C for 18 h furnished Pt-MADES (compound 5) as a pale yellow solid (36.4 g, 91% yield, purity 97.5%).
Example 9: purification of Pt-MADES
[00109] Pt-MADES (compound 5) (30 g, purity 94.7%) was suspended in a mixture of MeOH (300 mL, 10 Vol.) and formamide (150 mL, 5 Vol.). The suspension was heated at 60-65 °C for 2 h, then cooled to room temperature. Upon stirring at room temperature for 15 h, the resulting precipitate was filtered and washed with methanol (2 x 30 mL, 2 x 1 Vol.). Drying in a drying oven at 50 °C for 18 h furnished Pt-MADES (compound 5) as a pale yellow solid (22.5 g, 75% yield, purity 98.0%).
Example 10: purification of Pt-MADAC
[00110] Pt-MADAC (compound 6) (50 g, purity 94.0%) was suspended in a mixture of MeOH (150 mL, 3 Vol.) and formamide (50 mL, 1 Vol.). The suspension was heated at 60-65 °C for 2 h, and then cooled to room temperature. Upon stirring at room temperature for 15 h, a precipitate formed and was filtered and washed with methanol (2 x 50 mL, 2 x 1 Vol.). The collected precipitate was then dried in a drying oven at 50°C for 18 h. The thus-produced Pt-MADES was then suspended in MeOH (500 mL, 10 Vol.). This suspension was heated at reflux for 1 h, and then cooled to 0°C. The resulting precipitate was filtered and washed with methanol (2 x 50 mL, 2 x 1 Vol.). Drying in a drying oven at 50 °C for 18 h furnished Pt-MADAC (compound 6) as a pale yellow solid (41 g, 82% yield, purity 96.3%).
Example 11: Preparation of Pralatrexate, sodium salt (PLT-Na) (Compound 10a) by hydrolysis of Pralatrexate ethyl ester (PLT-ES) (Compound 9B)
[00111] A reactor was charged with EtOH (195 mL) and aqueous NaOH (3.75 M, 19.5 mL, 73 mmol). The mixture was then cooled down to 10 °C. 10-Propargyl-10-
deazaaminopterin ethyl ester (PLT-ES, Compound 9B, 13 g, 24.4 mmol) was added, and the temperature was increased to 25 °C over 0.5 h. The resulting suspension was then stirred at 25 °C for 17 h. The solid in the suspension was then isolated by filtration and washed with EtOH (65 mL). The collected solid was then dried in a drying oven at 45 °C for 18 h to provide (2S)-2-[[4-[(1 RS)-1-[(2,4-diaminopteridin-6-yl)methyl]but-3-ynyl]benzoyl]amino]pentanedioic acid disodium salt (Na-PLT; compound 10a) as a pale yellow solid (10.9 g, 86% yield, purity 99.6%).
Example 12: Preparation of Pralatrexate (Compound 10)
[00112] (2S)-2-[[4-[(1 RS)-1-[(2,4-Diaminopteridin-6-yl)methyl]but-3-ynyl]benzo-yl]amino]pentanedioic acid disodium salt (Na-PLT, Compound 10a, 10.9 g, 20.9 mmol) was dissolved in water (109 mL). The pH of the solution was adjusted to 4.5 by addition of aqueous HCl 1N. A precipitate formed and was isolated by filtration and washed with water (54 mL). The collected solid was then dried in a drying oven at 45 °C for 17 h to provide Pralatrexate (Compound 10) as a white solid (9.4 g, 81% yield, and purity 99.7%).
Example 13: Preparation of Pralatrexate ethyl ester (PLT-ES) (compound 9B)
[00113] A reactor was charged with potassium 10-propargyl-4-deoxy-4-amino-10-deazapteroate (K-Pt-MADEC, compound 11, 11.1 g, 28.7 mmol). DCM (82 ml) and 1-methyl-2-pyrrolidinone (16.7 ml) were added to obtain a suspension. 1-Hydroxy-benzotriazole hydrate (HOBt, 0.77 g, 5.74 mmol), N-(3-dimethylaminopropyl)-N’-ethylcarbodiimide hydrochloride (EDC, 6.60 g, 34.4 mmol) and (L)-glutamic acid
diethyl ester hydrochloride (7.98 g, 34.4 mmol) were sequentially added. The resulting mixture was stirred at room temperature until HPLC analysis showed reaction completion. DCM was removed under reduced pressure and MeOH (22.2 mL) was added. The reaction mixture was poured into water pre-acidified with aqueous HCl 16% (w/w, 16.9 mL). The pH was adjusted to 4.5 by addition of aqueous NaOH, resulting in the precipitation of the PLT-ES. The solid precipitate was isolated by filtration and dried in oven at 55 °C for 18 h to provide PLT-ES as a pale yellow solid (13 g, 85% yield, and purity 99.0%).
Example 14: Preparation of crystalline Pralatrexate ethyl ester (compound 9B)
[00114] PLT-ES (Compound 9B, lg) was dissolved in EtOH (15 ml). After a few minutes a precipitate started to form, and the precipitate was isolated by filtration after 45 minutes (0.5g, yellow solid, amorphous form). The mother liquor was left at room temperature overnight, resulting in the precipitation of a yellow solid which was isolated by filtration (0.3g, crystalline form, PXRD is shown on Figure 7).
Example 15: Hydrolysis of Pralatrexate ethyl ester (compound 9B)
[00115] A reactor was charged with MeOH (48 mL), aqueous NaOH (3.75 M, 18.0 mL, 67.5 mmol), and water (6 mL), and the mixture was cooled down to 10 °C. PLT-ES 9B (12 g, 22.5 mmol) was added and the temperature was increased to 25 °C over 1 h. The resulting suspension was stirred at 25 °C for 1 h, and then EtOH (168 mL) was added, resulting in the formation of a precipitate. After stirring for an additional 24 h the solid precipitate was isolated by filtration and washed with EtOH (120 mL).
The collected solid was then dried in a drying oven at 60 °C for 18 h to provide Na-PLT 10a (10.5 g, 90% yield, purity 99.8%) as a pale yellow solid.
PATENT
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2014068599
Pralatrexate is chemically, N-(4-{ 1-[(2,4-diaminopteridin-6-yl)methyl]but-3-yn-1 -yl}benzoyl)-L-glutamic acid and has the structural formula:
Pralatrexate is an anti-cancer therapy. It is the first drug approved as a treatment for patients with relapsed or refractory peripheral T-cell lymphoma, or PTCL – a biologically diverse group of aggressive blood cancers. Pralatrexate is currently marketed under the trade name FOLOTYN® by Alios.
Pralatrexate was disclosed in U.S. patent nos. 5,354,751 and 6,028,071.
According to the ‘071 patent, alpha-propargylhomoterephthalic acid dimethyl ester substantially free of homoterephthalic acid dimethyl ester was obtained by chromatographing alpha-propargylhomoterephthalic acid dimethyl ester residue obtained as part of the reaction between homoterephthalic acid dimethyl ester and propargyl bromide in the presence of
tetrahydrofuran and sodium hydride on silica gel using cyclohexane and ethyl acetate (8:1) for the elution.
Pralatrexate was also reported in J. Med. Chem, 1993, 36, 2228-2231. According to the paper, pralatrexate is prepared by crystallizing pralatrexate diethyl ester in a mixture of 2-methoxyethanol and water in the presence of sodium hydroxide.
International patent application publication no. WO 2012/061469 (‘469 patent) disclosed crystalline Form A, Form B and Form C of pralatrexate. According to the ‘469 patent, crystalline pralatrexate Form A can be prepared by crystallizing amorphous pralatrexate in formamide.
According to the ‘469 patent, crystalline pralatrexate Form B can be prepared by crystallizing amorphous pralatrexate in methanol or water.
According to the ‘469 patent, crystalline pralatrexate Form C can be prepared by crystallizing amorphous pralatrexate in a mixture of methanol and water.
Alpha-propargylhomoterephthalic acid dimethyl ester is a key staring material for the preparation of pralatrexate.
Example 1 :
Preparation of Alpha-propargylhomoterephthalic acid dimethyl ester
Sodium hydride (60 gm; 60%) was added to tetrahydrofuran (1500 ml) at room temperature and then cooled to 10 to 15°C. To the solution was added a solution of homoterephthalic acid dimethyl ester (250 gm) in tetrahydrofuran (250 ml) slowly for 15 minutes. The reaction mass was then cooled to 0 to -5°C and then added propargyl bromide (130 gm) in tetrahydrofuran (125 ml) slowly for 15 minutes at 0 to -5°C. The reaction mass was maintained for 2 hours at 0 to -5°C and then added methanol (50 ml). The temperature of the reaction mass was raised to room temperature and then added water (1500 ml) and diisopropyl ether (2500 ml), and then the layers were separated. The organic layer were dried with sodium sulfate and then concentrated to obtain 275 gm of alpha-propargylhomoterephthalic acid dimethyl ester.
Chromatographic purity of alpha-propargylhomoterephthalic acid dimethyl ester: 62.0%; Content of homoterephthalic acid dimethyl ester: 12.0%.
Example 2:
Purification of Alpha-propargylhomoterephthalic acid dimethyl ester
Alpha-propargylhomoterephthalic acid dimethyl ester (275 gm; HPLC Purity: 62.0%) as obtained in example 1 was dissolved in a mixture of hexane (1200 ml) and diisopropyl ether (65 ml) at room temperature. The solution was stirred for 15 hours at room temperature and filtered. The solid obtained was dried to obtain 175 gm of alpha-propargylhomoterephthalic acid dimethyl ester.
Chromatographic purity of alpha-propargylhomoterephthalic acid dimethyl ester: 74.6%; Content of homoterephthalic acid dimethyl ester: 0.4%.
Example 3:
Preparation of 10-propargyl-10-deazaminopterin diethyl ester
Step-I: Preparation oƒ 10-proparsyl-10-carbomethoxy-4-deoxy-4-amino-10-deazapteroic acid methyl ester
Sodium hydride (120 gm; 60%) was added to dimethylformamide (750 ml) at room temperature and then cooled to 0 to -5°C. To the solution was added a solution of alpha-propargylhomoterephthalic acid dimethyl ester (250 gm) in dimethylformamide (750 ml)
slowly for 15 minutes. The reaction mixture was maintained for 30 minutes at 0 to -5 C and then cooled to -20 to -25°C. To the reaction mixture was added 6-bromomethyl-pteridine-2,4-diamine (300 gm) in dimethylformamide (1500 ml) slowly for 30 minutes. The reaction mass was maintained for 2 hours at -20 to -25°C and then added methanol (300 ml). The temperature of the reaction mass was raised to room temperature and then added water (15000 ml) and diisopropyl ether (1500 ml). The contents were stirred for 2 hours at room temperature and filtered. The solid obtained was dried to obtain 198 gm of 10-propargyl-10-carbomethoxy-4-deoxy-4-amino-10-deazapteroic acid methyl ester.
Step-II: Preparation oƒ 10-proparsyl-10-carboxy-4-deoxy-4-amino-10-deazapteroic acid
2-Methoxyethanol (775 gm) was added to 10-propargyI-10-carbomethoxy-4-deoxy-4-amino-10-deazapteroic acid methyl ester (155 gm) at room temperature and then cooled to 15 to 20°C. To the reaction mixture was added a solution of sodium hydroxide (120 gm) in water (930 ml) and maintained for 4 hours at room temperature. The pH of the reaction mass was adjusted to 4.5 to 4.6 with acetic acid (50%) and then added water (3100 ml). The reaction mass was stirred for 2 hours, filtered and then dried to obtain 125 gm of 10-propargyl-10-carboxy-4-deoxy-4-amino-10-deazapteroic acid.
Step-III: Preparation oƒ 10-proparsyl-4-deoxy-4-amino-10-deazapteroic acid
10-Propargyl-10-carboxy-4-deoxy-4-amino-10-deazapteroic acid (135 gm) was added to dimethyl sulfoxide (1350 ml) at 120 to 125°C and maintained for 45 minutes at 120 to 125°C. The reaction mass was poured into water (3000 ml), maintained for 24 hours at room temperature and filtered to obtain a wet solid. To the wet solid was basified and then acetified, and maintained for 2 hours at room temperature. The separated solid was filtered and then dried to obtain 56 gm of 10-propargyl-4-deoxy-4-amino-10-deazapteroic acid.
Step-IV: Preparation oƒ 10-propargyl-10-deazaminopterin diethyl ester
Dimethylformamide (1 12 ml) was added to 10-propargyl-4-deoxy-4-amino-10-deazapteroic acid (14 gm) and stirred for 15 minutes. To the reaction mixture was added triethylamine (14 ml) and then cooled to 0 to -5°C. A solution of (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (21 gm) in dimethylformamide (28 ml) was added to the reaction mixture and maintained for 1 hour at 0 to -5°C. To the
reaction mixture was added L-glutamic acid diethyl ester (10 gm) in dimethylformamide (28 ml) slowly, maintained for 2 hours at -10 to -15°C and filtered. The pH of the filtrate obtained was adjusted with sodium hydroxide solution and then added water (700 ml) slowly for 45 minutes. The reaction mass was maintained for 2 hours at room temperature, filtered and then dried to obtain 14 gm of 10-propargyl-10-deazaminopterin diethyl ester.
Example 4:
Preparation of pralatrexate
10-Propargyl-10-deazaminopterin diethyl ester (40 gm) was dissolved in tetrahydrofuran (320 ml) at room temperature. The solution was then cooled to 15 to 20°C and added a solution of sodium hydroxide (24 gm) in water (400 ml) slowly for 15 minutes. The reaction mass was maintained for 45 minutes at 15 to 20°C and then added a mixture of tetrahydrofuran (200 ml) and ethyl acetate (200 ml). The layers were separated and to the aqueous layer was added water (80 ml). The separated aqueous layer was then concentrated and pH was adjusted to 4.7 to 4.8 with acetic acid (10%). The contents were stirred for 1 hour at room temperature and filtered. The solid obtained was then dried to obtain 28 gm of pralatrexate.
Chromatographic purity of pralatrexate: 98.5%;
Content of 10-propargyl-4-deoxy-4-amino-10-dezapteroic acid: 0.3%;
Content of 10-deazaaminopterin: 0.5%;
Example 5:
Purification of pralatrexate
The pralatrexate (28 gm: HPLC Purity: 98.5%) as obtained in example 4 was dissolved in tetrahydrofuran (400 ml) and then heated to 60°C. To the contents were added water (200 ml) at 60°C and then cooled to 5 to 10°C. The contents were stirred for 2 hours 30 minutes at 5 to 10°C, filtered and then dried to obtain a solid. The solid was dissolved in dimethyl sulfoxide (138 ml) and then stirred to obtain a clear solution. The solution was filtered through celite bed and then added ethanol (690 ml) slowly for 1 hour. The contents were stirred for 1 hour at room temperature, filtered and then dried to obtain 20 gm of pure pralatrexate.
Chromatographic purity of pralatrexate: 99.5%;
Content of 10-propargyl-4-deoxy-4-amino-10-dezapteroic acid: 0.06%; Content of 10-deazaaminopterin: 0.08%.
PAPER
Nonpolyglutamatable Antifolate N-alpha-(4 amino-4-deoxypteroyl)-Ndelta-hemiphthaloyl-L-ornithine”, JOURNAL OF MEDICINAL CHEMISTRY, AMERICAN CHEMICAL SOCIETY, US, vol. 45, no. 8, 1 January 2002 (2002-01-01), pages 1690 – 1696, XP002291409, ISSN: 0022-2623, DOI: 10.1021/JM010518T *
Details are disclosed for the synthesis of Nα-[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]-Nδ-hemiphthaloyl-l-ornithine (2) and Nα-[4-[5-(2,4-diaminoteridin-6-yl)pent-1-yn-4-yl]benzoyl]-Nδ-hemiphthaloyl-l-ornithine (6) as analogues of Nα-(4-amino-4-deoxypteroyl)-Nδ-hemiphthaloyl-l-ornithine (1, PT523), a nonpolyglutamatable antifolate currently in advanced preclinical development. In a 72 h growth inhibition assay against cultures of CCRF-CEM human leukemic lymphoblasts, the IC50 of 2 and 6 was 0.69 ± 0.044 nM and 1.3 ± 0.35 nM, respectively, as compared with previously reported values 4.4 ± 0.10 nM for aminopterin (AMT) and 1.5 ± 0.39 nM for PT523. In a spectrophotometric assay of dihydrofolate reductase (DHFR) inhibition using dihydrofolate and NADPH as the cosubstrates, the previously unreported compounds 2 and the mixed 10R and 10S diastereomers of 6 had Ki values of 0.21 ± 0.05 pM and 0.60 ± 0.02 pM, respectively, as compared with previously reported values of 3.70 ± 0.35 pM for AMT and 0.33 ± 0.04 pM for PT523. Thus, while they were comparable to 1 and several of its previously studied analogues in their ability to bind to DHFR and inhibit the growth of CCRF-CEM cells, 2 and the mixed diastereomers of 6 were several times more active than AMT despite the fact that they cannot form γ-polyglutamylated metabolites of the type formed in cells from AMT and other classical antifolates with a glutamate side chain.
Synthesis and In Vitro Antitumor Activity of New Deaza Analogues of the Nonpolyglutamatable Antifolate Nα-(4-Amino-4-deoxypteroyl)-Nδ-hemiphthaloyl-l-ornithine (PT523)

PATENT
https://patents.google.com/patent/CN107488112A/zh
PATENT
US 20150183789
https://patents.google.com/patent/US9440979B2/en
PATENT
Publication numberPriority datePublication dateAssigneeTitle
References
- ^ Jump up to:a b c d e [1], Allos Therapeutics Press Release, “Allos Therapeutics’ Pralatrexate Demonstrates Anticancer Activity in Multiple Cancer Cell Lines”.
- ^ Jump up to:a b c d [2], Allos Therapeutics Press Release, “Allos Therapeutics’ FOLOTYN(TM) First and Only FDA-Approved Therapy for Relapsed or Refractory Peripheral T-cell Lymphoma”.
- Jump up^ [3], FDA, “Fast Track, Accelerated Approval and Priority Review”.
- Jump up^ [4], Allos Therapeutics, “Allos Therapeutics, Inc. Q1 2010 Earnings Call Transcript”.
- ^ Jump up to:a b c [5], Psychiatric Times, “Principles of Oncologic Pharmacotherapy”.
- ^ Jump up to:a b [6], Memorial Sloan Kettering Cancer Center Press Release, “FDA Approves Lymphoma Drug Developed at Memorial Sloan Kettering”.
- Jump up^ [7], National Cancer Institute “NCI Cancer Bulletin: The Next Steps in Drug Development at NCI”.
- Jump up^ “FDA Approves Pralatrexate for Treatment of Peripheral T-Cell Lymphoma” (Press release). SRI International. 2009-09-25. Retrieved 2013-07-10.
- Jump up^ Avery, Greg (2012-09-07). “Purchase of Allos Therapeutics is completed”. Denver Business Journal. Retrieved 2013-07-10.
External links
- Pralatrexate Development Information
- Clinical trials of pralatrexate at ClinicalTrials.gov
- Folotyn website
- FocusonPTCL website
- ASAP Support For Assisting Patients
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Trade names | Folotyn |
AHFS/Drugs.com | Monograph |
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Intravenous |
ATC code | |
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ChEMBL | |
ECHA InfoCard | 100.205.791 |
Chemical and physical data | |
Formula | C23H23N7O5 |
Molar mass | 477.47 g/mol |
3D model (JSmol) | |
////////////プララトレキサート , japan 2017, Pralatrexate
NC1=NC2=NC=C(CC(CC#C)C3=CC=C(C=C3)C(=O)N[C@@H](CCC(O)=O)C(O)=O)N=C2C(N)=N1
Nusinersen sodium, ヌシネルセンナトリウム
ヌシネルセンナトリウム
Nusinersen Sodium
C234H323N61Na17O128P17S17 : 7500.89
[1258984-36-9 , ヌシネルセン]
Nusinersen sodium
C234H323N61O128P17S17.17Na, 7500.8854
UNII 4CHB7QQU1Q
ISIS 396443
Nusinersen sodium was approved by the US Food and Drug Administration (FDA) on Dec 23, 2016, and approved by the European Medicines Agency’s (EMA) on May 30, 2017, and approved by Pharmaceuticals and Medical Devices Agency of Japan (PMDA) on July 3, 2017.
JAPAN APPROVAL
2017/7/3 | Nusinersen sodium | Spinraza | Biogen Japan |
An antisense oligonucleotide that induces survival motor neuron (SMN) protein expression, it was approved by the U.S. FDA in December, 2016 as Spinraza for the treatment of children and adults with spinal muscular atrophy (SMA). It is adminstrated as direct intrathecal injection.
FREE FORM CAS: 1258984-36-9
CAS1258984-36-9
MFC234H340N61O128P17S17
ISIS-396443, ISIS-SMNRx, IONIS-SMNRx
RNA, (2′-0-(2-methoxyethyi))(p-thio)(m5u-c-a-c-m5u-m5u-m5u-c-a-m5ua- a-m5 u-g-c-m5u-g-g)
RNA, (2′-0-(2-METHOXYETHYI))(P-THIO)(M5U-C-A-C-M5U-M5U-M5U-C-A-M5UA- A-M5 U-G-C-M5U-G-G)
All-P-ambo-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiocytidylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioadenylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiocytidylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiocytidylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioadenylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioadenylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioadenylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioguanylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiocytidylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3’¨5′)-2′-O-(2-methoxyethyl)-P-thioguanylyl-(3’¨5′)-2′-O-(2-methoxyethyl)guanosine
ISIS-SMNRx is a drug that is designed to modulate the splicing of the SMN2 gene to significantly increase the production of functional SMN protein. The US regulatory agency has granted Orphan Drug Designation with Fast Track Status to nusinersen for the treatment of patients with SMA. The European regulatory agency has granted Orphan Drug Designation to nusinersen for the treatment of patients with SMA.
Nusinersen,[1] marketed as Spinraza,[3] is a medication used in treating spinal muscular atrophy (SMA),[4] a rare neuromuscular disorder. In December 2016, it became the first approved drug used in treating this disorder. Nusinersen has orphan drugdesignation in the United States and the European Union.[5]
FDA
FDA approves first drug for spinal muscular atrophy
New therapy addresses unmet medical need for rare disease
The U.S. Food and Drug Administration today approved Spinraza (nusinersen), the first drug approved to treat children and adults with spinal muscular atrophy (SMA), a rare and often fatal genetic disease affecting muscle strength and movement. Spinraza is an injection administered into the fluid surrounding the spinal cord.
For Immediate Release
December 23, 2016
The U.S. Food and Drug Administration today approved Spinraza (nusinersen), the first drug approved to treat children and adults with spinal muscular atrophy (SMA), a rare and often fatal genetic disease affecting muscle strength and movement. Spinraza is an injection administered into the fluid surrounding the spinal cord.
“There has been a long-standing need for a treatment for spinal muscular atrophy, the most common genetic cause of death in infants, and a disease that can affect people at any stage of life,” said Billy Dunn, M.D., director of the Division of Neurology Products in the FDA’s Center for Drug Evaluation and Research. “As shown by our suggestion to the sponsor to analyze the results of the study earlier than planned, the FDA is committed to assisting with the development and approval of safe and effective drugs for rare diseases and we worked hard to review this application quickly; we could not be more pleased to have the first approved treatment for this debilitating disease.”
SMA is a hereditary disease that causes weakness and muscle wasting because of the loss of lower motor neurons controlling movement. There is wide variability in age of onset, symptoms and rate of progression. Spinraza is approved for use across the range of spinal muscular atrophy patients.
The FDA worked closely with the sponsor during development to help design and implement the analysis upon which this approval was based. The efficacy of Spinraza was demonstrated in a clinical trial in 121 patients with infantile-onset SMA who were diagnosed before 6 months of age and who were less than 7 months old at the time of their first dose. Patients were randomized to receive an injection of Spinraza, into the fluid surrounding the spinal cord, or undergo a mock procedure without drug injection (a skin prick). Twice the number of patients received Spinraza compared to those who underwent the mock procedure. The trial assessed the percentage of patients with improvement in motor milestones, such as head control, sitting, ability to kick in supine position, rolling, crawling, standing and walking.
The FDA asked the sponsor to conduct an interim analysis as a way to evaluate the study results as early as possible; 82 of 121 patients were eligible for this analysis. Forty percent of patients treated with Spinraza achieved improvement in motor milestones as defined in the study, whereas none of the control patients did.
Additional open-label uncontrolled clinical studies were conducted in symptomatic patients who ranged in age from 30 days to 15 years at the time of the first dose, and in presymptomatic patients who ranged in age from 8 days to 42 days at the time of first dose. These studies lacked control groups and therefore were more difficult to interpret than the controlled study, but the findings appeared generally supportive of the clinical efficacy demonstrated in the controlled clinical trial in infantile-onset patients.
The most common side effects found in participants in the clinical trials on Spinraza were upper respiratory infection, lower respiratory infection and constipation. Warnings and precautions include low blood platelet count and toxicity to the kidneys (renal toxicity). Toxicity in the nervous system (neurotoxicity) was observed in animal studies.
The FDA granted this application fast track designation and priority review. The drug also received orphan drug designation, which provides incentives to assist and encourage the development of drugs for rare diseases.
The sponsor is receiving a rare pediatric disease priority review voucher under a program intended to encourage development of new drugs and biologics for the prevention and treatment of rare pediatric diseases. A voucher can be redeemed by a sponsor at a later date to receive priority review of a subsequent marketing application for a different product. This is the eighth rare pediatric disease priority review voucher issued by the FDA since the program began.
Spinraza is marketed by Biogen of Cambridge, Massachusetts and was developed by Ionis Pharmaceuticals of Carlsbad, California.
Medical use
The drug is used to treat spinal muscular atrophy associated with a mutation in the SMN1 gene. It is administered directly to the central nervous system (CNS) using intrathecal injection.[2]
In clinical trials, the drug halted the disease progression. In around 60% of infants affected by type 1 spinal muscular atrophy, the drug also significantly improved motor function.[2]
Side effects
Like other antisense drugs, there is a risk of abnormalities in blood clotting and a reduction in platelets as well as a risk of kidney damage.[2]
In clinical trials, people treated with nusinersen had an increased risk of upper and lower respiratory infections and congestion, ear infections, constipation, pulmonary aspiration, teething, and scoliosis. One infant in a clinical trial had severe lowering of salt levels and several had rashes. There is a risk that growth of infants and children might be stunted. In older clinical trial subjects, the most common adverse events were headache, back pain, and adverse effects from the spinal injection.[2]
Some people may develop antibodies against the drug; as of December 2016 it was unclear what effect this might have on efficacy or safety.[2]
Pharmacology
Spinal muscular atrophy is caused by loss-of-function mutations in the SMN1 gene which codes for survival motor neuron (SMN) protein. Patients survive owing to low amounts of the SMN protein produced from the SMN2 gene. Nusinersen modulates alternate splicing of the SMN2 gene, functionally converting it into SMN1 gene, thus increasing the level of SMN protein in the CNS.[6]
The drug distributes to CNS and to peripheral tissues.[2]
The half-life is estimated to be 135 to 177 days in CSF and 63 to 87 days in blood plasma. The drug is metabolized via exonuclease (3’- and 5’)-mediated hydrolysis and does not interact with CYP450 enzymes.[2] The primary route of elimination is likely by urinary excretion for nusinersen and its metabolites.[2]
Chemistry
Nusinersen is an antisense oligonucleotide in which the 2’-hydroxy groups of the ribofuranosyl rings are replaced with 2’-O-2-methoxyethyl groups and the phosphate linkages are replaced with phosphorothioate linkages.[2][6]
History
Nusinersen was discovered in a collaboration between Adrian Krainer at Cold Spring Harbor Laboratory and Ionis Pharmaceuticals (formerly called Isis Pharmaceuticals).[7][8][9][10] Partial work was done at the University of Massachusetts Medical School funded by Cure SMA.[11]
Starting in 2012, Ionis partnered with Biogen on development and in 2015 Biogen acquired an exclusive license to the drug for a US$75 million license fee, milestone payments up to US$150 million, and tiered royalties thereafter; Biogen also paid the costs of development subsequent to taking the license.[12] The license to Biogen included licenses to intellectual property that Ionis had acquired from Cold Spring Harbor Laboratory and University of Massachusetts.[13]
In November 2016, the new drug application was accepted under the FDA’s priority review process on the strength of the Phase III trial and the unmet need, and was also accepted for review at the European Medicines Agency (EMA) at that time.[14][15] It was approved by the FDA in December 2016 and by EMA in May 2017 as the first drug to treat spinal muscular atrophy.[16][17] Subsequently, nusinersen was approved to treat SMA in Canada (July 2017),[18] Japan (July 2017),[19] Brasil (August 2017)[20] and Switzerland (September 2017).[21]
Controversy
Spinraza list price is US$125,000 per injection which puts the treatment cost at US$750,000 in the first year and US$375,000 annually after that. According to the New York Times, this places Spinraza “among the most expensive drugs in the world”.[15]
As of October 2017, Spinraza is reimbursed by health insurance providers in the United States and by the public healthcare systems in France (SMA type 1 and 2 patients only), Germany (all patients), Iceland (all patients), Italy (all patients) and Japan (SMA type 1 only).[3]
In October 2017, the authorities in Denmark recommended Spinraza for use only in a small subset of patients with SMA type 1 (young babies) and refused to offer it as a standard treatment in all other SMA patients quoting an “unreasonably high price” compared to the clinical effect.[22] Norwegian authorities rejected the funding in October 2017 because the price of the medicine was “unethically high”.[23] In February 2018 the funding was approved for patients under 18 years old.[23]
In January 2018 public funding of Spinraza was approved in Israel.
Nusinersen (formerly, IONIS-SMNRx, ISIS-SMNRx), intended to be marketed as Spinraza,[1] is an investigational drug for spinal muscular atrophy developed by Ionis Pharmaceuticals and Biogen with financial support from SMA Foundation and Cure SMA. It is a proprietary antisense oligonucleotide that modulates alternate splicing of the SMN2 gene, functionally converting it into SMN1 gene.
The drug is administered directly to the central nervous system using intrathecal injection once every 3–4 months.
Nusinersen has orphan drug designation in the United States and the European Union.[2]
In August 2016, a phase III trial in type 1 SMA patients was ended early due to positive efficacy data, with Biogen deciding to file for regulatory approval for the drug.[3]Consequently, the company submitted a New Drug Application to the FDA in September 2016[4] and a marketing authorisation application to the European Medicines Agency, under the centralised procedure,[5] in the following month. The company also announced an expanded access programme of nusinersen in type 1 SMA in selected countries.
In November 2016, a phase III clinical trial in type 2 SMA patients was halted after an interim analysis indicated the drug’s efficacy also in this SMA type.[6]
P.S. : The views expressed are my personal and in no-way suggest the views of the professional body or the company that I represent.
References
- ^ Jump up to:a b “International Nonproprietary Names for Pharmaceutical Substances (INN). Recommended International Nonproprietary Names: List 74” (PDF). World Health Organization. pp. 413–14. Retrieved 13 March 2017.
- ^ Jump up to:a b c d e f g h i j k “Nusinersen US Label” (PDF). FDA. December 2016. For updates see FDA index page for NDA 209531
- ^ Jump up to:a b “Nusinersen”. AdisInsight. Retrieved 1 January 2017.
- Jump up^ Ottesen, Eric W. (2017-01-01). “ISS-N1 makes the first FDA-approved drug for spinal muscular atrophy”. Translational Neuroscience. 8 (1): 1–6. doi:10.1515/tnsci-2017-0001. ISSN 2081-6936. PMC 5382937
. PMID 28400976.
- Jump up^ “Nusinersen”. UK Specialist Pharmacy Service. Retrieved 31 December 2016.
- ^ Jump up to:a b Zanetta, C; Nizzardo, M; Simone, C; Monguzzi, E; Bresolin, N; Comi, GP; Corti, S (1 January 2014). “Molecular Therapeutic Strategies for Spinal Muscular Atrophies: Current and Future Clinical Trials”. Clinical Therapeutics. 36 (1): 128–40. doi:10.1016/j.clinthera.2013.11.006. PMID 24360800.
- Jump up^ Garber, K (11 October 2016). “Big win possible for Ionis/Biogen antisense drug in muscular atrophy”. Nature Biotechnology. 34 (10): 1002–1003. doi:10.1038/nbt1016-1002. PMID 27727217.
- Jump up^ Wadman, Meredith (23 December 2016). “Updated: FDA approves drug that rescues babies with fatal neurodegenerative disease”. Science.
- Jump up^ Offord, Catherine (December 1, 2016). “Oligonucleotide Therapeutics Near Approval”. The Scientist.
- Jump up^ Tarr, Peter (24 December 2016). “CSHL FDA approval of life-saving SMA drug is hailed by its researcher-inventor at CSHL”. Cold Spring Harbor Laboratory.
- Jump up^ “Therapeutic Approaches”. http://www.curesma.org. Cure SMA. Retrieved 1 January 2017.
- Jump up^ “Biogen Shells Out $75M to Develop Ionis’ Nusinersen after Positive Phase III Results”, Genetic Engineering News, August 1, 2016
- Jump up^ “Press release: Biogen and Ionis Pharmaceuticals Report Nusinersen Meets Primary Endpoint at Interim Analysis of Phase 3 ENDEAR Study in Infantile-Onset Spinal Muscular Atrophy | Biogen Media”. Biogen. August 1, 2016.
- Jump up^ “Regulatory Applications for SMA Therapy Nusinersen Accepted in US, EU”. BioNews Services, LLC. Retrieved 2016-11-15.
- ^ Jump up to:a b Katie Thomas (December 30, 2016). “Costly Drug for Fatal Muscular Disease Wins F.D.A. Approval”. New York Times.
- Jump up^ Grant, Charley (2016-12-27). “Surprise Drug Approval Is Holiday Gift for Biogen”. Wall Street Journal. ISSN 0099-9660. Retrieved 2016-12-27.
- Jump up^ “Spinraza (nusinersen)”. European Medicines Agency. Retrieved 2017-10-27.
- Jump up^ “Biogen’s SPINRAZA™ (nusinersen) Receives Notice of Compliance from Health Canada for the Treatment of 5q Spinal Muscular Atrophy (SMA)”. Cision. 2017-07-04.
- Jump up^ “Biogen to launch Spinraza in Japan soon”. 2017-07-10.
- Jump up^ “Remédio inédito para atrofia muscular espinhal é liberado” (in Portuguese). 2017-08-25.
- Jump up^ “Spinraza – Zulassung nun auch in der Schweiz” (in German). SMA Schweiz. 2017-09-30.
- Jump up^ Medicinrådet siger nej til lægemiddel til børn med muskelsvind: ‘Urimeligt’ dyrt Retrieved October 13 2017.
- ^ Jump up to:a b Dette er uforståelig og utrolig urettferdig
Further reading
- Finkel, Richard S; Chiriboga, Claudia A; Vajsar, Jiri; Day, John W; Montes, Jacqueline; De Vivo, Darryl C; Yamashita, Mason; Rigo, Frank; Hung, Gene; Schneider, Eugene; Norris, Daniel A; Xia, Shuting; Bennett, C Frank; Bishop, Kathie M (2016). “Treatment of infantile-onset spinal muscular atrophy with nusinersen: A phase 2, open-label, dose-escalation study”. The Lancet. 388 (10063): 3017. doi:10.1016/S0140-6736(16)31408-8.
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|
Clinical data | |
---|---|
Trade names | Spinraza |
Synonyms | IONIS-SMNRx, ISIS-SMNRx |
AHFS/Drugs.com | Multum Consumer Information |
License data | |
Routes of administration |
Injection into cerebrospinal fluid |
ATC code | |
Legal status | |
Legal status |
|
Pharmacokinetic data | |
Metabolism | Exonuclease (3’- and 5’)-mediated hydrolysis |
Biological half-life | 135–177 days (in CSF), 63–87 days (in plasma) |
Identifiers | |
CAS Number | |
PubChem CID | |
DrugBank | |
ChemSpider | |
UNII | |
KEGG | |
Chemical and physical data | |
Formula | C234H323N61Na17O128P17S17[2] |
Molar mass | 7501 Da[2] |
3D model (JSmol) |
////////////////Nusinersen sodium, Spinraza, ヌシネルセンナトリウム, FDA 2016, EU 2017, JAPAN 2017
CC1=CN(C(=O)NC1=O)C2C(C(C(O2)CO)OP(=S)(O)OCC3C(C(C(O3)N4C=C(C(=NC4=O)N)C)OCCOC)OP(=S)(O)OCC5C(C(C(O5)N6C=NC7=C6N=CN=C7N)OCCOC)OP(=S)(O)OCC8C(C(C(O8)N9C=C(C(=NC9=O)N)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=NC1=O)N)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=NC2=C1N=CN=C2N)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=NC2=C1N=CN=C2N)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=NC2=C1N=CN=C2N)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=NC2=C1N=C(NC2=O)N)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=NC1=O)N)C)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=C(C(=O)NC1=O)C)OCCOC)OP(=O)(OCC1C(C(C(O1)N1C=NC2=C1N=C(NC2=O)N)OCCOC)OP(=S)(O)OCC1C(C(C(O1)N1C=NC2=C1N=C(NC2=O)N)OCCOC)O)S)OCCOC
Amenamevir アメナメビル
Amenamevir アメナメビル
M-5220
CAS 841301-32-4
Chemical Formula: C24H26N4O5S
Molecular Weight: 482.555
N-(2-((4-(1,2,4-oxadiazol-3-yl)phenyl)amino)-2-oxoethyl)-N-(2,6-dimethylphenyl)tetrahydro-2H-thiopyran-4-carboxamide 1,1-dioxide
PMDA
2017/7/3 | PMDA | APPROVED | JAPAN | Amenamevir | Amenalief
BRAND |
Maruho
COMPANY |
Amenamevir, also known as ASP2151, is a herpes virus helicase-primase inhibitor. ASP2151 had significantly better anti-HSV activity against herpes simplex keratitis than valacyclovir and acyclovir after systemic or topical use.
アメナメビル Amenamevir ![]() C24H26N4O5S : 482.55 [841301-32-4] |
Amenamevir is an oral helicase-primase inhibitor launched in 2017 in Japan for the treatment of herpes zoster (shingles). The product is being marketed by Maruho.
Amenamevir had been in phase III clinical trials for herpes simplex virus;
In August 2012, Astellas Pharma granted Maruho development and commercialization rights in Japan.
US 20050032855
WO 2006082822
WO 2006082820
WO 2006082821
WO 2009123169
WO 2010047295
JP 2006241144
Patent
The publicly known crystal (following and alpha type crystal) of the compound A of disclosure to the aforementioned Patent document 2 is obtained by re-crystallizing from an ethanol water mixed solvent, and has the melting point of about 220 to 222 degree C. The present invention relates to multi-form crystals other than the alpha form crystal concerned, and relates to beta, gamma, delta, and epsilon type crystal specifically. In a surprising thing, each of these multi-form crystals is crystals stable to a degree usable as a medicinal manufacture field object, and has a preferable property in the surface of solubility, absorbency, stability, and/or a handling property
PATENT
US20050032855, EP1844776A1.
REFERENCES
1: Ohtsu Y, Otsuka S, Nakamura T, Noguchi K. Regulated bioanalysis of conformers – A case study with ASP2151 in dog plasma and urine. J Chromatogr B Analyt Technol Biomed Life Sci. 2015 Aug 1;997:56-63. doi: 10.1016/j.jchromb.2015.05.028. Epub 2015 May 28. PubMed PMID: 26093120.
2: James SH, Larson KB, Acosta EP, Prichard MN. Helicase-primase as a target of new therapies for herpes simplex virus infections. Clin Pharmacol Ther. 2015 Jan;97(1):66-78. doi: 10.1002/cpt.3. Epub 2014 Nov 18. Review. PubMed PMID: 25670384.
3: Muylaert I, Zhao Z, Elias P. UL52 primase interactions in the herpes simplex virus 1 helicase-primase are affected by antiviral compounds and mutations causing drug resistance. J Biol Chem. 2014 Nov 21;289(47):32583-92. doi: 10.1074/jbc.M114.609453. Epub 2014 Oct 2. PubMed PMID: 25278021; PubMed Central PMCID: PMC4239612.
4: Biswas S, Sukla S, Field HJ. Helicase-primase inhibitors for herpes simplex virus: looking to the future of non-nucleoside inhibitors for treating herpes virus infections. Future Med Chem. 2014 Jan;6(1):45-55. doi: 10.4155/fmc.13.192. Review. PubMed PMID: 24358947.
5: Andrei G, Snoeck R. Advances in the treatment of varicella-zoster virus infections. Adv Pharmacol. 2013;67:107-68. doi: 10.1016/B978-0-12-405880-4.00004-4. Review. PubMed PMID: 23886000.
6: Sasaki S, Miyazaki D, Haruki T, Yamamoto Y, Kandori M, Yakura K, Suzuki H, Inoue Y. Efficacy of herpes virus helicase-primase inhibitor, ASP2151, for treating herpes simplex keratitis in mouse model. Br J Ophthalmol. 2013 Apr;97(4):498-503. doi: 10.1136/bjophthalmol-2012-302062. Epub 2013 Jan 29. PubMed PMID: 23361434.
7: Katsumata K, Chono K, Kato K, Ohtsu Y, Takakura S, Kontani T, Suzuki H. Pharmacokinetics and pharmacodynamics of ASP2151, a helicase-primase inhibitor, in a murine model of herpes simplex virus infection. Antimicrob Agents Chemother. 2013 Mar;57(3):1339-46. doi: 10.1128/AAC.01803-12. Epub 2012 Dec 28. PubMed PMID: 23274658; PubMed Central PMCID: PMC3591930.
8: Chono K, Katsumata K, Suzuki H, Shiraki K. Synergistic activity of amenamevir (ASP2151) with nucleoside analogs against herpes simplex virus types 1 and 2 and varicella-zoster virus. Antiviral Res. 2013 Feb;97(2):154-60. doi: 10.1016/j.antiviral.2012.12.006. Epub 2012 Dec 20. PubMed PMID: 23261844.
9: Chono K, Katsumata K, Kontani T, Shiraki K, Suzuki H. Characterization of virus strains resistant to the herpes virus helicase-primase inhibitor ASP2151 (Amenamevir). Biochem Pharmacol. 2012 Aug 15;84(4):459-67. doi: 10.1016/j.bcp.2012.05.020. Epub 2012 Jun 9. PubMed PMID: 22687623.
10: Katsumata K, Weinberg A, Chono K, Takakura S, Kontani T, Suzuki H. Susceptibility of herpes simplex virus isolated from genital herpes lesions to ASP2151, a novel helicase-primase inhibitor. Antimicrob Agents Chemother. 2012 Jul;56(7):3587-91. doi: 10.1128/AAC.00133-12. Epub 2012 Apr 23. PubMed PMID: 22526302; PubMed Central PMCID: PMC3393391.
11: Tyring S, Wald A, Zadeikis N, Dhadda S, Takenouchi K, Rorig R. ASP2151 for the treatment of genital herpes: a randomized, double-blind, placebo- and valacyclovir-controlled, dose-finding study. J Infect Dis. 2012 Apr 1;205(7):1100-10. doi: 10.1093/infdis/jis019. Epub 2012 Feb 20. PubMed PMID: 22351940.
12: Himaki T, Masui Y, Chono K, Daikoku T, Takemoto M, Haixia B, Okuda T, Suzuki H, Shiraki K. Efficacy of ASP2151, a helicase-primase inhibitor, against thymidine kinase-deficient herpes simplex virus type 2 infection in vitro and in vivo. Antiviral Res. 2012 Feb;93(2):301-4. doi: 10.1016/j.antiviral.2011.11.015. Epub 2011 Dec 4. PubMed PMID: 22155691.
13: Katsumata K, Chono K, Sudo K, Shimizu Y, Kontani T, Suzuki H. Effect of ASP2151, a herpesvirus helicase-primase inhibitor, in a guinea pig model of genital herpes. Molecules. 2011 Aug 25;16(9):7210-23. doi: 10.3390/molecules16097210. PubMed PMID: 21869749.
14: Andrei G, Snoeck R. Emerging drugs for varicella-zoster virus infections. Expert Opin Emerg Drugs. 2011 Sep;16(3):507-35. doi: 10.1517/14728214.2011.591786. Epub 2011 Jun 24. Review. PubMed PMID: 21699441.
15: Chono K, Katsumata K, Kontani T, Kobayashi M, Sudo K, Yokota T, Konno K, Shimizu Y, Suzuki H. ASP2151, a novel helicase-primase inhibitor, possesses antiviral activity against varicella-zoster virus and herpes simplex virus types 1 and 2. J Antimicrob Chemother. 2010 Aug;65(8):1733-41. doi: 10.1093/jac/dkq198. Epub 2010 Jun 9. PubMed PMID: 20534624
///////////Amenamevir, アメナメビル, japan 2017, ASP2151, ASP 2151, M-5220, MARUHO, Amenalief
O=C(C(CC1)CCS1(=O)=O)N(C2=C(C)C=CC=C2C)CC(NC3=CC=C(C4=NOC=N4)C=C3)=O
Forodesine Hydrochloride
Forodesine
- Molecular FormulaC11H14N4O4
- Average mass266.253 Da
CAS No. : 284490-13-7
Molecular Formula: C11H15ClN4O4
Average Mass: 302.72 g/mol
Forodesine (INN; also known as Immucillin H; trade names Mundesine and Fodosine) is a transition-state analog inhibitor of purine nucleoside phosphorylase[1] studied for the treatment of patients with T-cell acute lymphoblastic leukemia (T-ALL) and for treatment of B-cell acute lymphocytic leukemia (B-ALL).
Forodesine was originally discovered by Vern Schramm‘s laboratory at the Albert Einstein College of Medicine in New York and Industrial Research Limited in New Zealand.
Forodesine is being developed by BioCryst Pharmaceuticals. As of 2008, it is currently in phase II clinical trials.[2].
In 2006, BioCryst entered into a licensing agreement with Mundipharma International Holdings Limited to develop and commercialize forodesine in markets across Europe, Asia, and Australasia for use in oncology.[3]
In April 2017, forodesine was approved in Japan for the treatment of relapsed/refractory peripheral T-cell lymphoma.[4]
ema
On 20 September 2010, orphan designation (EU/3/10/780) was granted by the European Commission to Mundipharma Research Limited, United Kingdom, for forodesine for the treatment of chronic lymphocytic leukaemia
Active substance | Forodesine hydrochloride |
---|---|
Decision number | P/69/2010 |
PIP number | EMEA-000785-PIP01-09 |
Pharmaceutical form(s) | Hard capsule |
Condition(s)/indication(s) | Cutaneous T-cell lymphoma (CTCL) |
Route(s) of administration | Oral use |
PIP applicant | Applicant: Mundipharma Research Ltd E-mail: paediatric@mundipharma-rd.eu Country: United Kingdom Phone: +44 1223424900 Fax: +44 1223426054 |
Decision type | W: decision granting a waiver in all age groups for the listed condition(s) |
On 20 September 2010, orphan designation (EU/3/10/780) was granted by the European Commission to Mundipharma Research Limited, United Kingdom, for forodesine for the treatment of chronic lymphocytic leukaemia.
What is chronic lymphocytic leukaemia?
Chronic lymphocytic leukaemia (CLL) is cancer of a type of white blood cell called B lymphocytes. In this disease, the lymphocytes multiply too quickly and live for too long, so that there are too many of them circulating in the blood. The cancerous lymphocytes look normal, but they are not fully developed and do not work properly. Over a period of time, the abnormal cells replace the normal white blood cells, red blood cells and platelets (components that help the blood to clot) in the bone marrow (the spongy tissue inside the large bones in the body). CLL is the most common type of leukaemia and mainly affects older people. It is rare in people under the age of 40 years. CLL is a long-term debilitating and life-threatening disease because some patients develop severe infections. What is the estimated number of patients affected by the condition? At the time of designation, CLL affected approximately 3 in 10,000 people in the European Union (EU)*. This is equivalent to a total of around 152,000 people, and is below the threshold for orphan designation, which is 5 people in 10,000. This is based on the information provided by the sponsor and the knowledge of the Committee for Orphan Medicinal Products (COMP).
What treatments are available? Treatment for CLL is complex and depends on a number of factors, including the extent of the disease, whether it has been treated before, and the patient’s age, symptoms and general state of health. Patients whose CLL is not causing any symptoms or is only getting worse very slowly may not need
Forodesine Hydrochloride was originally developed by BioCryst Pharmaceuticals and then licensed to Mundipharma and in particular is marketed in Japan under the trade name Mundesine®. Forodesine Hydrochloride is a transitional analogue inhibitor of purine nucleoside phosphorylase (PNP). Mundesine® is approved for the treatment of peripheral T-cell lymphoma (PTCL).
Mundesine® is a capsule that contains 100mg of free Forodesine per capsule. The recommended dose is 300mg orally, twice daily.
In 2004, the compound was eligible for orphan drug treatment for non-Hodgkin’s lymphoma (NHL), chronic myelogenous leukemia (CLL) and hairy cell leukemia, respectively. In 2007, the compound was eligible for the EU orphan drug for the treatment of acute lymphoblastic leukemia (ALL) and cutaneous T-cell lymphoma (CTCL). In 2010, the compound was eligible for EU orphan drug for treatment of CLL. In 2006, the compound obtained Japanese orphan drug eligibility for CTCL treatment.
Forodesine, or 7-[(2S,3S,4R,5R)-3,4-dihydroxy-5-(hydroxymethyl)-2-pyrrolidinyl]-l,5-dihydropyrrolo[2,3-e]pyrimidin-4-one, is an inhibitor of purine nucleoside phosphorylase. It is currently in development as a treatment for peripheral T-Cell Lymphoma .
W099/19338 describes a compound genus as a new class of inhibitors of nucleoside metabolism, including Forodesine. The compounds effect as inhibitors of purine nucleoside phosphorylase is taught as efficacious to suppress T-cell function and to treat infections caused by protozoan parasites.
WO00/61783 describes a number of processes for preparing molecules described in W099/19338. Reaction scheme 3 on page 23 of the published application describes a synthesis of Forodesine, characterised by the removal of two acid labile protecting groups in the final step to yield the hydrochloride salt.
Forodesine is a particularly difficult molecule to make on a commercial scale. The current process for manufacture requires a coupling reaction under cryogenic temperature conditions of -55C. Subsequent steps involve the use of a high pressure hydrogenation reaction. Such extreme reaction conditions provide for safety concerns, particularly when conducted on a bulk scale. Further the products of the reaction were extremely challenging to purify. The effect of all this is to require more sophisticated and expensive equipment at the manufacturing plant; all of which add up to an increased cost of goods for patients. Accordingly a new manufacturing process was sought.
Surprisingly a new route has been invented which is shorter, cheaper, less dangerous and provides an increased overall yield whilst still conforming to the required purity profile.
The current manufacturing process is described in Fig 1.
5C
, MeOH, reflux xchange
tallisation
Fig l
Within the diagram, the following acronyms are used, wherein NCS is N-Chlorosuccinimide, OTBDMS is t-butyldimethylsiloxy protecting group, MtBE is methyl t-butyl ether, (BOC)20 is di-t-butyldicarbonate and BOC is t-butyloxycarbonyl protecting group,
Particularly problematic in this process is the requirement to conduct the coupling of process step (iii) at exceptionally low temperature. Further challenges are provided by process step (v) the hydrogenation reaction to remove the benxylyoxymethyl (BOM) protecting group, before removing the other acid labile protecting groups.
Conducting hydrogenation reactions with their need for a high pressure environment requires specialist equipment. Such apparatus is expensive, adding to the cost of the materials produced. Despite the use of specialist equipment, safety concerns can never be eradicated. Whilst BOM can, in certain circumstances, be acid labile, treatment of analogues of the molecules described in Fig 1 with acid has always resulted in incomplete removal of the protecting group, leading to a large number of partially deprotected impurities. This makes purification exceptionally difficult as well as reducing the overall yield for the step.
A new improved process has been developed as described in Fig 2:
Toluene
Fig 2
The new route has a number of clear advantages. The coupling reaction (ix) is conducted at a warmer -15°C, rather than the challenging cryogenic conditions of -55°C required previously. It eradicates the hydrogenation step, avoiding the need for dangerous high pressure conditions. It also makes the overall process much quicker and cheaper; not only are the conditions challenging, but the reagents used in large quantities such as palladium are expensive and environmentally challenging.
The classical method to remove a BOM protecting group is by catalytic hydrogenation. It is however known to be unstable in acid conditions. For this reasons there have been previous attempts to remove BOM at the same time as the three acid labile protecting groups. This has always been unsuccessful as treatment with acid typically resulted in incomplete deprotection, leading to a mixture of products. This made for a tricky purification and a reduced yield. Surprisingly under the particular conditions described herein it has been possible to effect the transformation in greater yield and without a difficult purification. The final product is obtained in equal or greater purity than material obtained from the previous route.
PATENT
Scheme 13
HO OH 1 . HCI/Acetone, MeOH OCH,
2. PPh3, imidazole I
HO (EtO)2POCH2CN
OH O O
Ribose Λ 13a
References for preparation of compound 13a:
1. Mishra, Girija Prasad; Rao, Batchu Venkateswara; Tetrahedron: Asymmetry (2011), 22(7), 812-817.
2. Brock, E. Anne; Davies, Stephen G.; Lee, James A.; Roberts, Paul M.; Thomson,
James E; Organic Letters (2011), 13(7), 1594-1597.
3. WO 2010/085377 A2 (incorporated by reference).
4. Yadav, J. S.; Reddy, P. Narayana; Reddy, B. V. Subba; Synlett (2010), (3), 457- 461.
5. Song, Kai; Zheng, Guo-jun; Huaxue Shiji (2010), 32(2), 171-172.
6. Prabhakar, Peddikotla; Rajaram, Singanaboina; Reddy, Dorigondla Kumar;
Shekar, Vanam; Venkateswarlu, Yenamandra; Tetrahedron: Asymmetry (2010), 21(2), 216-221.
7. CN 101182342 A.
8. Baird, Lynton J.; Timmer, Mattie S. M.; Teesdale-Spittle, Paul H.; Harvey, Joanne
E; Journal of Organic Chemistry (2009), 74(6), 2271-2277.
9. Wang, Xiang-cheng; Wang, Gang; Qu, Gang-lian; Huaxue Shijie (2008), 49(4), 226-228.
10. Ivanova, N. A.; Valiullina, Z. R.; Shitikova, O. V.; Miftakhov, M. S; Russian
Journal of Organic Chemistry (2007), 43(5), 742-746.
11. Braga, Fernanda Gambogi; Coimbra, Elaine Soares; Matos, Magnum de Oliveira;
Lino Carmo, Arturene Maria; Cancio, Marisa Damato; da Silva, Adilson David; European Journal of Medicinal Chemistry (2007), 42(4), 530-537.
12. Wender, Paul A.; Bi, F. Christopher; Buschmann, Nicole; Gosselin, Francis; Kan, Cindy; Kee, Jung-Min; Ohmura, Hirofumi; Organic Letters (2006), 8(23), 5373- 5376.
13. Fei, Xiangshu; Wang, Ji-Quan; Miller, Kathy D.; Sledge, George W.; Hutchins, Gary D.; Zheng, Qi-Huang; Nuclear Medicine and Biology (2004), 31(8), 1033- 1041.
14. Abdel-Rahman, Adel A.-H.; Abdel-Megied, Ahmed E.-S.; Goda, Adel E.-S.; Zeid,
Ibrahim F.; El Ashry, El Sayed H; Nucleosides, Nucleotides & Nucleic Acids (2003), 22(11), 2027-2038.
15. Palmer, Andreas M.; Jager, Volker; European Journal of Organic Chemistry
(2001), (7), 1293-1308.
16. Paquette, Leo A.; Bailey, Simon; Journal of Organic Chemistry (1995), 60(24),
7849-56.
17. Classon, Bjoern; Liu, Zhengchun; Samuelsson, Bertil; Journal of Organic
Chemistry (1988), 53(26), 6126-30.
18. Kissman, Henry M.; Baker, B. R; Journal of the American Chemical Society
(1957), 79 5534-40.
References for cyclizations related to preparation of compounds of type 13d:
1. Davies, Stephen G.; Durbin, Matthew J.; Goddard, Euan C; Kelly, Peter M.;
Kurosawa, Wataru; Lee, James A.; Nicholson, Rebecca L.; Price, Paul D.;
Roberts, Paul M.; Russell, Angela J.; Scott, Philip M.; Smith, Andrew D; Organic & Biomolecular Chemistry (2009), 7(4), 761-776.
2. Davies, Stephen G.; Nicholson, Rebecca L.; Price, Paul D.; Roberts, Paul M.;
Russell, Angela J.; Savory, Edward D.; Smith, Andrew D.; Thomson, James E; Tetrahedron: Asymmetry (2009), 20(6-8), 758-772.
3. Davies, Stephen G.; Nicholson, Rebecca L.; Price, Paul D.; Roberts, Paul. M.;
Smith, Andrew D; Synlett (2004), (5), 901-903.
4. Brock, E. Anne; Davies, Stephen G.; Lee, James A.; Roberts, Paul M.; Thomson, James E; Organic Letters (2011), 13(7), 1594-1597.
5. Gary B. Evans, Richard H. Furneaux, Andrzej Lewandowicz, Vern L. Schramm, and Peter C. Tyler, Journal of Medicinal Chemistry (2003), 46, 3412-3423.
PATENT
WO 2016110527
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2016110527
The invention also provides for the synthesis of a compound of formula (II)
By reacting a compound of Formula (VII)
With di-t-butyldicarbonate.
Preferably the reaction is conducted at -10 to -20°C, in methyl t-butyl ether & heptane
The invention also provides for the synthesis of a compound of formula (VII)
By reacting a compound of Formula (IV)
With a suitable base to form
Before reacting with a compound of Formula (III)
Example 1
Stage 1 Manufacture of (III)
Compound of formula (III) (approx. 130g) in toluene solution is added to a suspension of N-Chlorosuccinimide in toluene at 20°C over a period of 90min. The reaction mixture is stirred at 20°C for 1 hour then chilled to 0°C and stirred for a further hour. The precipitated succinimide by-product is removed by filtration and the filtered solution charged directly to a 45% potassium hydroxide solution (aq) containing
tetrabutylammonium bromide. The reaction mixture is stirred at 0°C and completion of reaction is confirmed by GC analysis. Water is then added to the two-phase mixture to dissolve inorganic precipitates and the toluene product solution is washed with a 28% ammonium hydroxide/acetic acid buffer mixture with sodium chloride added. After phase separation the organic phase solution is stabilised with triethylamine. Magnesium sulfate is added to dry the solution. After filtration, the yield of (III) is determined by R.O.E. and GC purity.
Stage 2 Manufacture of (II)
Stage 2a Lithiation
A suspension of compound of formula (IV) (approx. 200g) in MtBE is chilled to -15°C and treated with /7-Hexyl lithium (2.5M in hexanes) added over 2h, maintaining the reaction mixture at -15°C. The mixture is then stirred for 3h at -15°C.
Stage 2b Coupling with (IV)
After lithiation is complete, a compound formula (III) in toluene solution is added to the reaction mixture maintaining the contents at -15°C. The reaction mixture is then stirred at this temperature for 1.5h.
Stage 2c Boc anhydride quench
A solution of di-t-butyldicarbonate in MtBE is added to the above reaction mixture at -15°C. The solution is stirred for a further 30min.
Workup and Purification
The reaction mixture is quenched by addition of RO water, then filtered. The aqueous layer is separated and run to waste. The organic layer is again washed with water. The organic layer is concentrated to a low volume and solvent replaced by heptane. The mix is stirred for 16h and filtered again.
The solution is passed through a silica gel column and eluted with heptane. The resulting solution is treated with charcoal – stirred for 3h, then filtered. The product (II) is progressed as a solution in heptane to the next stage.
Stage 3 Manufacture of Crude Forodesine (la)
Stage 3 Deprotection with cone. HCI
Concentrated hydrochloric acid is added to (II) in heptane and the mixture stirred. The acid phase is separated off and stirred for 16h at ambient temperature. The solution is then heated to 40°C for 6h. The water is then distilled off under reduced pressure to a minimum volume.
Ethanol is then added to precipitate the crude Forodesine (la) which is isolated by filtration after cooling 0-5°C. It is washed with ethanol and dried in a vacuum oven at 75°C to a constant weight.
Stage 4a Decolourization of crude Forodesine (la) using Ion-Exchange Column
Crude Forodesine (la) is dissolved in water and loaded onto a freshly prepared ion-exchange column containing Dowex 50WX4 resin in the Na+ form activated with 30% sodium hydroxide solution. The ion-exchange column is eluted with 4 x lOOmL water followed by 4 x lOOmL 2M HCI. The HCI fractions are collected separately as they contain the desired product. The 2M HCI fractions are combined and concentrated under vacuum with minimum RO water added to dissolve the residue. 1,4-Dioxane is added to the aqueous solution to precipitate the product. The mixture is stirred at 20°C for 1.5h. The product is filtered, washed with 1,4-dioxane and dried in a vacuum oven at 35°C to a constant weight to give decolourised BCX1777.
Stage 4b Recrystallization of Forodesine
Decolourised Forodesine is added to in 0.6M dilute hydrochloric acid and heated to 45°C to dissolve. The resulting solution is hot filtered and washed through with some RO Water. The solution is cooled to 20°C and ethanol added over at least lh. The mixture is then seeded with Forodesine HCI. The resulting slurry is stirred for 8h at 20°C, then cooled to 2°C for a further 1.5h. The product is isolated by filtration, washed twice with cold ethanol then dried in a vacuum oven at 75°C to a constant weight to give a white crystalline Forodesine HCI (approx. 50g).
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one of skill in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. Moreover, all embodiments described herein are considered to be broadly applicable and combinable with any and all other consistent embodiments, as appropriate.
PAPER
Journal of Medicinal Chemistry (2009), 52(4), 1126-1143.
Third-Generation Immucillins: Syntheses and Bioactivities of Acyclic Immucillin Inhibitors of Human Purine Nucleoside Phosphorylase
* To whom correspondence should be addressed. Phone: +64-4-9313040. Fax: +64-4-9313055. E-mail: g.evans@irl.cri.nz., †
Carbohydrate Chemistry Team, Industrial Research Limited.
, ‡
Department of Biochemistry, Albert Einstein College of Medicine of Yeshiva University.
References
- Jump up^ Kicska GA, Long L, Hörig H, et al. (April 2001). “Immucillin H, a powerful transition-state analog inhibitor of purine nucleoside phosphorylase, selectively inhibits human T lymphocytes”. Proc. Natl. Acad. Sci. U.S.A. 98 (8): 4593–8. Bibcode:2001PNAS…98.4593K. doi:10.1073/pnas.071050798. PMC 31879
. PMID 11287638.
- Jump up^ “Complete list of clinical trials for forodesine (BCX-1777) (ClinicalTrials.gov)”. Retrieved 2008-07-22.
- Jump up^ “Biocryst Initiates Pivotal Fodosine Phase IIb Clinical Trial In Patients With Relapsed/Refractory T-Lymphoblastic Leukemia/Lymphoma”(Press release). January 16, 2007.
- Jump up^ “BioCryst Announces Mundipharma Receives Approval for Mundesine® in Japan” (Press release). April 3, 2017.
External links
- “From cell biology to therapy: forodesine”. Hematology Meeting Reports. 2 (5): 106–111. 2008.
- Gore, L; Stelljes, M; Quinones, R (2007). “Forodesine treatment and post-transplant graft-versus-host disease in two patients with acute leukemia: Facilitation of graft-versus-leukemia effect?”. Seminars in Oncology. 34 (6 Suppl 5): S35–9. doi:10.1053/j.seminoncol.2007.11.005. PMID 18086346.
- 18 December 2006 Fodosine orphan designation by the European Commission for acute lymphoblastic leukaemia.
- BioCryst Pharmaceuticals, Inc. have entered into an exclusive license agreement with Mundipharma for develop and commercialize BioCryst’s lead compound, Forodesine.
- Birmingham, Alabama – February 2, 2006 Mundipharma will obtain rights in markets across Europe, Asia and Australasia to Forodesine™ in the field of oncology in exchange for a $10 million up-front payment. Furthermore, Mundipharma will commit up to an additional $15 million to assist in the evaluation of Forodesine’s™ therapeutic safety and efficacy profile. BioCryst may also receive future event payments totalling $155 million in addition to royalties on product sales of Forodesine™ by Mundipharma.
- News BioCryst provides Fodosine update March 27, 2007. “Voluntarily Placed on Hold by BioCryst (…) we don’t think the final response rate will be as high as 18%”.
- The European Commission granted a marketing authorisation valid throughout the European Union for Atriance on 22 August 2007 for acute lymphoblastic leukaemia. What benefit has Atriance shown during the studies? Atriance was shown to be effective in a proportion of the patients in both studies. In the first study, among the 39 children and young adults who se cancer had not responded to two or more previous treatments, five (13%) had a complete response to treatment after a month, with no evidence of disease and normal blood counts. In the second study, among the 28 adults and adolescents with cancer that had not responded to two or more previous tre atments, five (18%) had a complete response to treatment. In both studies, more patients had a partial response to Atriance treatment, with blood counts returning towards normal levels.
- Lino Berton collects all the information on Forodesine in www.linoberton.com site, putting them in a row. In 2014 he published the book Qualcosa che non muore where he tells his incredible experience in the closed trial early in 2007.
- Il Giornale.it (in Italian). “Come si boicotta un farmaco che funziona”. Dated 08-01-2016.
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Clinical data | |
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Trade names | Mundesine and Fodosine |
Routes of administration |
oral |
Identifiers | |
CAS Number | |
PubChem CID | |
ChemSpider | |
UNII | |
KEGG | |
ChEMBL | |
Chemical and physical data | |
Formula | C11H14N4O4 |
Molar mass | 266.26 g·mol−1 |
3D model (JSmol) |
/////////Forodesine Hydrochloride, Forodesine, BCX 1777, Immucillin-H, FOSODINE, JAPAN 2017