1H and 13C NMR spectra of 2-acyl-substituted cyclohexane-1,3-diones (acyl = formyl, 1; 2-nitrobenzoyl, 2; 2-nitro-4-trifluoromethylbenzoyl, 3) and lithium sodium and potassium salts of 1have been measured. The compound 3, known as NTBC, is a life-saving medicine applied in tyrosinemia type I. The optimum molecular structures of the investigated objects in solutions have been found using the DFT method with B3LYP functional and 6-31G** and/or 6-311G(2d,p) basis set. The theoretical values of the NMR parameters of the investigated compounds have been calculated using GIAO DFT B3LYP/6-311G(2d,p) method. The theoretical data obtained for compounds 1−3 have been exploited to interpret their experimental NMR spectra in terms of the equilibrium between different tautomers. It has been found that for these triketones an endo-tautomer prevails. The differences in NMR spectra of the salts of 1 can be rationalized taking into account the size of the cation and the degree of salt dissociation. It seems that in DMSO solution the lithium salt exists mainly as an ion pair stabilized by the chelation of a lithium cation with two oxygen atoms. The activation free energy the of formyl group rotation for this salt has been estimated to be 51.5 kJ/mol. The obtained results suggest that in all the investigated objects, including the free enolate ions, all atoms directly bonded to the carbonyl carbons lie near the same plane. Some observations concerning the chemical shift changes could indicate strong solvation of the anion of 1 by water molecules. Implications of the results obtained in this work for the inhibition mechanism of (4-hydroxyphenyl) pyruvate dioxygenase by NTBC are commented upon.
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Brilliant blue G
FDA 2019, 12/20/2019, TISSUEBLUE, New Drug Application (NDA): 209569
Company: DUTCH OPHTHALMIC, PRIORITY; Orphan
OPQ recommends APPROVAL of NDA 209569 for commercialization of TissueBlue (Brilliant Blue G Ophthalmic Solution), 0.025%
ブリリアントブルーG, C.I. Acid Blue 90
Brilliant Blue G
Derma Cyanine G
////////////Brilliant blue G , ブリリアントブルーG , C.I. Acid Blue 90, FDA 2019, PRIORITY, Orphan
- Benzenemethanaminium, N-[4-[[4-[(4-ethoxyphenyl)amino]phenyl][4-[ethyl[(3-sulfophenyl)methyl]amino]-2-methylphenyl]methylene]-3-methyl-2,5-cyclohexadien-1-ylidene]-N-ethyl-3-sulfo-, hydroxide, inner salt, monosodium salt
- Benzenemethanaminium, N-[4-[[4-[(4-ethoxyphenyl)amino]phenyl][4-[ethyl[(3-sulfophenyl)methyl]amino]-2-methylphenyl]methylene]-3-methyl-2,5-cyclohexadien-1-ylidene]-N-ethyl-3-sulfo-, inner salt, monosodium salt (9CI)
- Brilliant Indocyanine G (6CI)
- C.I. Acid Blue 90 (7CI)
- C.I. Acid Blue 90, monosodium salt (8CI)
- Acid Blue 90
- Acid Blue G 4061
- Acid Blue PG
- Acid Bright Blue G
- Acid Brilliant Blue G
- Acid Brilliant Cyanine G
- Acidine Sky Blue G
- Amacid Brilliant Cyanine G
- Anadurm Cyanine A-G
- Benzyl Cyanine G
- Biosafe Coomassie Stain
- Boomassie blue silver
- Brilliant Acid Blue G
- Brilliant Acid Blue GI
- Brilliant Acid Blue J
- Brilliant Acid Cyanine G
- Brilliant Blue G
- Brilliant Blue G 250
- Brilliant Blue J
- Brilliant Indocyanine GA-CF
- Bucacid Brilliant Indocyanine G
- C.I. 42655
- CBB-G 250
- Colocid Brilliant Blue EG
- Coomassie Blue G
- Coomassie Blue G 250
- Coomassie Brilliant Blue G
- Coomassie Brilliant Blue G 250
- Coomassie G 250
- Cyanine G
- Daiwa Acid Blue 300
- Derma Cyanine G
- Derma Cyanine GN 360
- Dycosweak Acid Brilliant Blue G
- Eriosin Brilliant Cyanine G
- Fenazo Blue XXFG
- Impero Azure G
- Kayanol Cyanine G
- Lerui Acid Brilliant Blue G
- Milling Brilliant Blue 2J
- NSC 328382
- Optanol Cyanine G
- Orient Water Blue 105
- Orient Water Blue 105S
- Polar Blue G
- Polar Blue G 01
- Polycor Blue G
- Sandolan Cyanine N-G
- Sellaset Blue B
- Serva Blue G
- Serva Blue G 250
- Silk Fast Cyanine G
- Simacid Blue G 350
- Sumitomo Brilliant Indocyanine G
- Supranol Cyanin G
- Supranol Cyanine G
- Triacid Fast Cyanine G
- Water Blue 105
- Water Blue 105S
- Water Blue 150
- Xylene Brilliant Cyanine G
Antineoplastic, Tyrosine kinase inhibitor
|No.||Drug Name||Active Ingredient||Approval Date||FDA-approved use on approval date*|
|1.||Ayvakit||avapritinib||1/9/2020||To treat adults with unresectable or metastatic gastrointestinal stromal tumor (GIST)|
PRIORITY; Orphan, NDA 212608
Avapritinib, sold under the brand name Ayvakit, is a medication used for the treatment of tumors due to one specific rare mutation: It is specifically intended for adults with unresectable or metastatic ( y) gastrointestinal stromal tumor (GIST) that harbor a platelet-derived growth factor receptor alpha (PDGFRA) exon 18 mutation.
Common side effects are edema (swelling), nausea, fatigue/asthenia (abnormal physical weakness or lack of energy), cognitive impairment, vomiting, decreased appetite, diarrhea, hair color changes, increased lacrimation (secretion of tears), abdominal pain, constipation, rash. and dizziness.
The U.S. Food and Drug Administration (FDA) approved avapritinib in January 2020. The application for avapritinib was granted fast track designation, breakthrough therapy designation, and orphan drug designation. The FDA granted approval of Ayvakit to Blueprint Medicines Corporation.
Avapritinib was approved based on the results from the Phase I NAVIGATOR clinical trial involving 43 patients with GIST harboring a PDGFRA exon 18 mutation, including 38 subjects with PDGFRA D842V mutation. Subjects received avapritinib 300 mg or 400 mg orally once daily until disease progression or they experienced unacceptable toxicity. The recommended dose was determined to be 300 mg once daily. The trial measured how many subjects experienced complete or partial shrinkage (by a certain amount) of their tumors during treatment (overall response rate). For subjects harboring a PDGFRA exon 18 mutation, the overall response rate was 84%, with 7% having a complete response and 77% having a partial response. For the subgroup of subjects with PDGFRA D842V mutations, the overall response rate was 89%, with 8% having a complete response and 82% having a partial response. While the median duration of response was not reached, 61% of the responding subjects with exon 18 mutations had a response lasting six months or longer (31% of subjects with an ongoing response were followed for less than six months).
Example 7: Synthesis of (R)-l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl-lH-pyrazol-4- yl)pyrrolo[2, 1 -f\ [ 1 ,2,4] triazin-4-yl)piperazin- 1 -yl)pyrimidin-5-yl)ethanamine and (S)- 1 – (4- fluorophenyl)- l-(2-(4-(6-(l-methyl-lH-pyrazol-4-yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)ethanamine (Compounds 43 and 44)
Step 1 : Synthesis of (4-fluorophenyl)(2-(4-(6-(l-methyl- lH-pyrazol-4-yl)pyrrolo[2,l- f] [ 1 ,2,4] triazin-4-yl)piperazin- 1 -yl)pyrimidin-5-yl)methanone:
4-Chloro-6-(l-methyl- lH-pyrazol-4-yl)pyrrolo[2,l-/] [l,2,4]triazine (180 mg, 0.770 mmol), (4-fluorophenyl)(2-(piperazin-l-yl)pyrimidin-5-yl)methanone, HC1 (265 mg, 0.821 mmol) and DIPEA (0.40 mL, 2.290 mmol) were stirred in 1,4-dioxane (4 mL) at room temperature for 18 hours. Saturated ammonium chloride was added and the products extracted into DCM (x2). The combined organic extracts were dried over Na2S04, filtered through Celite eluting with DCM, and the filtrate concentrated in vacuo. Purification of the residue by MPLC (25- 100% EtOAc-DCM) gave (4-fluorophenyl)(2-(4-(6-(l-methyl-lH-pyrazol-4-yl)pyrrolo[2,l- ] [l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)methanone (160 mg, 0.331 mmol, 43 % yield) as an off-white solid. MS (ES+) C25H22FN90 requires: 483, found: 484 [M + H]+.
Step 2: Synthesis of (5,Z)-N-((4-fluorophenyl)(2-(4-(6-(l-methyl- lH-p razol-4-yl)p rrolo[2, l- ] [l,2,4]triazin-4- l)piperazin- l-yl)pyrimidin-5-yl)methylene)-2-methylpropane-2-sulfinamide:
(S)-2-Methylpropane-2-sulfinamide (110 mg, 0.908 mmol), (4-fluorophenyl)(2-(4-(6-(l- methyl- lH-pyrazol-4-yl)pyrrolo[2,l-/][l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5- yl)methanone (158 mg, 0.327 mmol) and ethyl orthotitanate (0.15 mL, 0.715 mmol) were stirred in THF (3.2 mL) at 70 °C for 18 hours. Room temperature was attained, water was added, and the products extracted into EtOAc (x2). The combined organic extracts were washed with brine, dried over Na2S04, filtered, and concentrated in vacuo while loading onto Celite. Purification of the residue by MPLC (0- 10% MeOH-EtOAc) gave (5,Z)-N-((4-fluorophenyl)(2-(4-(6-(l-methyl- lH-pyrazol-4-yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin-l-yl)pyrimidin-5-yl)methylene)-2- methylpropane-2-sulfinamide (192 mg, 0.327 mmol, 100 % yield) as an orange solid. MS (ES+) C29H3iFN10OS requires: 586, found: 587 [M + H]+.
Step 3: Synthesis of (lS’)-N-(l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl- lH-pyrazol-4- l)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin-l-yl)pyrimidin-5-yl)ethyl)-2-methylpropane-2-
(lS’,Z)-N-((4-Fluorophenyl)(2-(4-(6-(l-methyl-lH-pyrazol-4-yl)pyrrolo[2,l- ] [l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)methylene)-2-methylpropane-2-sulfinamide (190 mg, 0.324 mmol) was taken up in THF (3 mL) and cooled to 0 °C. Methylmagnesium bromide (3 M solution in diethyl ether, 0.50 mL, 1.500 mmol) was added and the resulting mixture stirred at 0 °C for 45 minutes. Additional methylmagnesium bromide (3 M solution in diethyl ether, 0.10 mL, 0.300 mmol) was added and stirring at 0 °C continued for 20 minutes. Saturated ammonium chloride was added and the products extracted into EtOAc (x2). The combined organic extracts were washed with brine, dried over Na2S04, filtered, and concentrated in vacuo while loading onto Celite. Purification of the residue by MPLC (0-10% MeOH-EtOAc) gave (lS’)-N-(l-(4-fluorophenyl)-l-(2-(4-(6-(l-methyl- lH-pyrazol-4-yl)pyrrolo[2, l- ] [l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)ethyl)-2-methylpropane-2-sulfinamide (120 mg, 0.199 mmol, 61.5 % yield) as a yellow solid (mixture of diastereoisomers). MS (ES+) C3oH35FN10OS requires: 602, found: 603 [M + H]+. Step 4: Synthesis of l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl- lH-pyrazol-4-yl)pyrrolo[2,l- f\ [ 1 ,2,4] triazin-4- l)piperazin- 1 -yl)pyrimidin-5-yl)ethanamine:
(S)-N- ( 1 – (4-Fluorophenyl)- 1 -(2- (4- (6-( 1 -methyl- 1 H-pyrazol-4-yl)pyrrolo [2,1- /] [l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)ethyl)-2-methylpropane-2-sulfinamide (120 mg, 0.199 mmol) was stirred in 4 M HCl in 1,4-dioxane (1.5 mL)/MeOH (1.5 mL) at room temperature for 1 hour. The solvent was removed in vacuo and the residue triturated in EtOAc to give l-(4-fluorophenyl)- l-(2-(4-(6-(l -methyl- lH-pyrazol-4-yl)pyrrolo[2, l-/][l,2,4]triazin-4- yl)piperazin- l-yl)pyrimidin-5-yl)ethanamine, HCl (110 mg, 0.206 mmol, 103 % yield) as a pale yellow solid. MS (ES+) C26H27FN10requires: 498, found: 482 [M- 17 + H]+, 499 [M + H]+.
Step 5: Chiral separation of (R)-l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl- lH-pyrazol-4- yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin-l-yl)pyrimidin-5-yl)ethanamine and (5)-1-(4- fluorophenyl)- l-(2-(4-(6-(l-methyl-lH-pyrazol-4-yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin- 1 -yl)pyrimidin- -yl)ethanamine:
The enantiomers of racemic l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl- lH-pyrazol-4- yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin-l-yl)pyrimidin-5-yl)ethanamine (94 mg, 0.189 mmol) were separated by chiral SFC to give (R)-l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl-lH- pyrazol-4-yl)pyrrolo[2, l-/][l,2,4]triazin-4-yl)piperazin- l-yl)pyrimidin-5-yl)ethanamine (34.4 mg, 0.069 mmol, 73.2 % yield) and (lS,)-l-(4-fluorophenyl)- l-(2-(4-(6-(l-methyl-lH-pyrazol-4- yl)pyrrolo[2, l-/] [l,2,4]triazin-4-yl)piperazin-l-yl)pyrimidin-5-yl)ethanamine (32.1 mg, 0.064 mmol, 68.3 % yield). The absolute stereochemistry was assigned randomly. MS (ES+)
C26H27FN10 requires: 498, found: 499 [M + H]+.
- “FDA approves the first targeted therapy to treat a rare mutation in patients with gastrointestinal stromal tumors”. U.S. Food and Drug Administration (FDA) (Press release). 9 January 2020. Archived from the original on 11 January 2020. Retrieved 9 January 2020. This article incorporates text from this source, which is in the public domain.
- “Blueprint Medicines Announces FDA Approval of AYVAKIT (avapritinib) for the Treatment of Adults with Unresectable or Metastatic PDGFRA Exon 18 Mutant Gastrointestinal Stromal Tumor”. Blueprint Medicines Corporation (Press release). 9 January 2020. Archived from the original on 11 January 2020. Retrieved 9 January 2020.
- “Blueprint Medicines Announces Updated NAVIGATOR Trial Results in Patients with Advanced Gastrointestinal Stromal Tumors Supporting Development of Avapritinib Across All Lines of Therapy”. Blueprint Medicines Corporation (Press release). 15 November 2018. Archived from the original on 10 January 2020. Retrieved 9 January 2020.
- Wu CP, Lusvarghi S, Wang JC, et al. (July 2019). “Avapritinib: A Selective Inhibitor of KIT and PDGFRα that Reverses ABCB1 and ABCG2-Mediated Multidrug Resistance in Cancer Cell Lines”. Mol. Pharm. 16 (7): 3040–3052. doi:10.1021/acs.molpharmaceut.9b00274. PMID 31117741.
- Gebreyohannes YK, Wozniak A, Zhai ME, et al. (January 2019). “Robust Activity of Avapritinib, Potent and Highly Selective Inhibitor of Mutated KIT, in Patient-derived Xenograft Models of Gastrointestinal Stromal Tumors”. Clin. Cancer Res. 25 (2): 609–618. doi:10.1158/1078-0432.CCR-18-1858. PMID 30274985.
|Other names||BLU-285, BLU285|
|Drug class||Antineoplastic agents|
|Chemical and physical data|
|Molar mass||498.570 g·mol−1|
|3D model (JSmol)|
///////Avapritinib, 2020 APPROVALS, PRIORITY, Orphan, BLU-285, BLU285, FDA 2020, Ayvakit, アバプリチニブ , авапритиниб , أفابريتينيب ,
Launched – 2002, NTBC
Nitisinone is a synthetic reversible inhibitor of 4-hydroxyphenylpyruvate dioxygenase. It is used in the treatment of hereditary tyrosinemia type 1. It is sold under the brand name Orfadin.
Nitisinone was first approved by the U.S. Food and Drug Administration (FDA) on January 18, 2002, then approved by the European Medicines Agency (EMA) on February 21, 2005. It was developed and marketed as Orfadin® by Swedish Orphan Biovitrum AB (SOBI) in the US .
The mechanism of action of nitisinone involves reversibile inhibition of 4-Hydroxyphenylpyruvate dioxygenase(HPPD). It is indicated for use as an adjunct to dietary restriction of tyrosine and phenylalanine in the treatment of hereditary tyrosinemia type 1 (HT-1).
Orfadin® is available as capsule for oral use, containing 2, 5 or 10 mg of free Nitisinone. The recommended initial dose is 1 mg/kg/day divided into two daily doses. Maximum dose is 2 mg/kg/day.
Nitisinone was launched in 2002 by Swedish Orphan (now Swedish Orphan Biovitrum) in a capsule formulation as an adjunct to dietary restriction of tyrosine and phenylalanine in the treatment of hereditary tyrosinemia type I. In 2015, this product was launched in Japan for the same indication. The same year, an oral suspension formulation for pediatric patients was registered in the E.U., and launch took place in the United Kingdom shortly after. This formulation was approved in 2016 in the U.S. for the same indication. In 2016, nitisinone tablet formulation developed by Cycle Pharmaceuticals was approved in Canada (this formulation is also available also in the U.S.).
Used as an adjunct to dietary restriction of tyrosine and phenylalanine in the treatment of hereditary tyrosinemia type 1.
22 June 2017 EMA/CHMP/502860/2017
Product name, strength, pharmaceutical form: Orfadin • Marketing authorisation holder: Swedish Orphan Biovitrum International AB • Date of authorisation: 21/02/2005
Procedure No. EMEA/H/C/004281/0000
During the meeting on 22 June 2017, the CHMP, in the light of the overall data submitted and the scientific discussion within the Committee, issued a positive opinion for granting a Marketing authorisation to Nitisinone MendeliKABS.
The chemical name of nitisinone is 2-[2-Nitro-4-(trifluoromethyl)benzoyl]-1,3-cyclohexanedione corresponding to the molecular formula C14H10F3NO5. It has a relative molecular mass of 329.23 g/mol and the following structure: Figure 1. Structure of nitisinone.
Nitisinone appears as off-white to yellowish non-hygroscopic fine crystalline powder. It is practically insoluble in unbuffered water. It is freely soluble in dichloromethane, sparingly soluble in ethyl alcohol, slightly soluble in isopropyl alcohol and 70% aqueous isopropyl alcohol and in pH 6.8 phosphate buffer, very slightly soluble in pH 4.5 acetate buffer and practically insoluble at pH 1.1. Solubility in acidified aqueous media depends on the acid counter ion. Solubility increases with increasing pH. Its pKa was found to be around 10. Nitisinone is achiral and does not show polymorphism.
Nitisinone is a white to yellowish-white crystalline powder poorly soluble in water. The active substance is a weak acid and it is highly soluble in the pH range 4.5-7.2 in phosphate buffer solutions. Nitisinone has the chemical name 2-(2-nitro-4-trifluoromethylbenzoyl)-cyclohexane-1,3-dione. It does not show polymorphism.
Company: Swedish Orphan Biovitrum AB
Application No.: 206356Orig1
Approval Date: April 22, 2016
- Approval Letter(s) (PDF)
- Printed Labeling (PDF)
- Summary Review (PDF)
- Officer/Employee List (PDF)
- Cross Discipline Team Leader Review (PDF)
- Chemistry Review(s) (PDF)
- Pharmacology Review(s) (PDF)
- Clinical Pharmacology Biopharmaceutics Review(s) (PDF)
- Proprietary Name Review(s) (PDF)
- Other Review(s) (PDF)
- Administrative Document(s) & Correspondence (PDF)
Nitisinone (INN), also known as NTBC (an abbreviation of its full chemical name) is a medication used to slow the effects of hereditary tyrosinemia type 1. Since its first use for this indication in 1991, it has replaced liver transplantation as the first-line treatment for this rare condition. It is also being studied in the related condition alkaptonuria. It is marketed under the brand name Orfadin by the company Swedish Orphan Biovitrum (Sobi); it was first brought to market by Swedish Orphan International. It was originally developed as a candidate herbicide.
It has been demonstrated that treatment with nitisinone can reduce urinary levels of homogentisic acid in alkaptonuria patients by 95%. A series of clinical trials run by DevelopAKUre to determine whether nitisinone is effective at treating the ochronosis suffered by patients with alkaptonuria are ongoing. If the trials are successful, DevelopAKUre will try to get nitisinone licensed for use by alkaptonuria patients.
Mechanism of action
The mechanism of action of nitisinone involves reversibile inhibition of 4-Hydroxyphenylpyruvate dioxygenase (HPPD). This is a treatment for patients with Tyrosinemia type 1 as it prevents the formation of maleylacetoacetic acid and fumarylacetoacetic acid, which have the potential to be converted to succinyl acetone, a toxin that damages the liver and kidneys. This causes the symptoms of Tyrosinemia type 1 experienced by untreated patients.
Alkaptonuria is caused when an enzyme called homogentisic dioxygenase (HGD) is faulty, leading to a buildup of homogenisate.Alkaptonuria patients treated with nitisinone produce far less HGA than those not treated (95% less in the urine), because nitisinone inhibits HPPD, resulting in less homogenisate accumulation. Clinical trials are ongoing to test whether nitisinone can prevent ochronosisexperienced by older alkaptonuria patients.
Nitisinone has several negative side effects; these include but are not limited to: bloated abdomen, dark urine, abdominal pain, feeling of tiredness or weakness, headache, light-colored stools, loss of appetite, weight loss, vomiting, and yellow-colored eyes or skin.
Research at the National Institutes of Health (NIH) has demonstrated that nitisinone can reduce urinary levels of HGA by up to 95% in patients with alkaptonuria. The primary parameter of the NIH trial was range of hip motion, for which the results were inconclusive.
Research done using alkaptonuric mice has shown that mice treated with nitisinone experience no ochronosis in knee joint cartilage. In contrast, all of the mice in the untreated control group developed ochronotic knee joints.
The efficacy of Nitisinone is now being studied in a series international clinical trials called DevelopAKUre. The studies will recruit alkaptonuria patients in Europe. A larger number of patients will be recruited in these trials than in the previous NIH trial. The trials are funded by the European Commission.
Nitisinone was discovered as part of a program to develop a class of herbicides called HPPD inhibitors. It is a member of the benzoylcyclohexane-1,3-dione family of herbicides, which are chemically derived from a natural phytotoxin, leptospermone, obtained from the Australian bottlebrush plant (Callistemon citrinus). HPPD is essential in plants and animals for catabolism, or breaking apart, of tyrosine. In plants, preventing this process leads to destruction of chlorophyll and the death of the plant. In toxicology studies of the herbicide, it was discovered that it had activity against HPPD in rats and humans.
In Type I tyrosinemia, a different enzyme involved in the breakdown of tyrosine, fumarylacetoacetate hydrolase is mutated and doesn’t work, leading to very harmful products building up in the body. Fumarylacetoacetate hydrolase acts on tyrosine after HPPD does, so scientists working on making herbicides in the class of HPPD inhibitors hypothesized that inhibiting HPPD and controlling tyrosine in the diet could treat this disease. A series of small clinical trials attempted with one of their compounds, nitisinone, were conducted and were successful, leading to nitisinone being brought to market as an orphan drug Swedish Orphan International, which was later acquired by Swedish Orphan Biovitrum (Sobi).
Sobi is now a part of the DevelopAKUre consortium. They are responsible for drug supply and regulatory support in the ongoing clinical trials that will test the efficiacy of nitisinone as a treatment for alkaptonuria. It is hoped that if the trials are successful, nitisinone could also be licensed for treatment of alkaptonuria.
There is no generic version of Orfadin in G7 countries. Prior to the market authorization of MDK-Nitisinone in Canada, the only Nitisinone product available globally was Orfadin.Until recently, Nitisinone was not approved in Canada where it was distributed for over 20 years via a Health Canada Special Access Program. In September 2016, MendeliKABS was granted approval of a Priority New Drug Submission (PNDS) by Health Canada for a bioequivalent generic version of Orfadin capsules (MDK-Nitisinone). In November 2016 Cycle Pharma was also granted approval of a PNDS by Health Canada for Nitisinone tablets that are bioequivalent to Orfadin capsules. SOBI was granted approval of a PNDS in December 2016.
1H NMR, 13C NMR, and Computational DFT Studies of the Structure of 2-Acylcyclohexane-1,3-diones and Their Alkali Metal Salts in Solution
2-(2-Nitro-4-trifluoromethylbenzoyl)cyclohexane-1,3-dione (NTBC; 3). The compound was prepared in the same manner as 2. The synthesis of an appropriate benzoic acid derivative was started from the transformation of commercially available 2-nitro-4-trifluoromethylaniline into benzonitrile by the classical Sandmeyer method. Then the nitrile was hydrolyzed in 65% sulfuric acid to give 2-nitro-4-trifluoromethylbenzoic acid.13 The obtained triketone 3 had a mp of 140−142 °C (lit.14 141−143 °C). For NMR data, see Supporting Information….. https://pubs.acs.org/doi/suppl/10.1021/jo060583g/suppl_file/jo060583gsi20060420_080852.pdf
NMR data for 2-(2-nitro-4-trifluoromethylbenzoyl)cyclohexane-1,3-dione, 3, in CDCl3
1 H NMR: 16.25 (s, 1H, OH), 8.47 (ddq, 1H, H10, J10,12=1.7 Hz, J10,13=0.4 Hz, J10,F=0.7 Hz), 7.94 (ddq, 1H, H12, J12,13=8.0 Hz, J12,F=0.7 Hz), 7.39 (ddq, 1H, H13, J13,F=0.8 Hz), 2.81 (t-like m, 2H, H4, H4’, JH4,H4’= -18.8 Hz, JH4,H5=5.4 Hz, JH4,H5’=7.3 Hz, JH4,H6=0.7 Hz, JH4,H6’= -0.8 Hz), 2.37 (tlike m, 2H, H6, H6’, JH6,H6’= -16.5 Hz, JH6,H5=4.6 Hz, JH6,H5’=8. 5 Hz), 2.04 (pentet-like m, 2H, H5, H5’, JH5,H5’= -13.6 Hz.
13C NMR: 196.3 (s, C(O)Ph), 195.8 (s, C3), 194.1 (s, C1), 145.5 (s, C9), 139.7 (s, C8), 132.0 (q, C11, J11,F=34.3 Hz), 130.8 (q, C12 J12,F=3.5 Hz), 127.7 (s, C13), 122.6 (q, CF3, JC,F=272.9 Hz), 121.1 (q, C10, J10,F=3.9 Hz), 112.7 (s, C2), 37.3 (s, C6) 31.6 (s, C4), 19.1 (s, C5).
The condensation of cyclohexane-1,3-dione (I) with 2-nitro-4-(trifluoromethyl)benzoyl chloride by means of TEA in dichloromethane gives the target Nitisinone.EP 0186118
JP 1986152642, US 4774360, US 4780127
- Synonyms:NTBC, SC 0735
- Use:treatment of inherited tyrosinemia type I
- Chemical name:2-[2-nitro-4-(trifluoromethyl)benzoyl]-1,3-cyclohexanedione
- MW:329.23 g/mol
Substances Referenced in Synthesis Path
|CAS-RN||Formula||Chemical Name||CAS Index Name|
|USA||Orfadin||Swedish Orphan ,2002|
- cps. 2 mg
- WO 9 300 080 (ICI; 7.1.1993; appl. 18.6.1992; GB-prior. 24.6.1991).
- US 4 774 360 (Stauffer Chemical; 27.9.1988; appl. 29.6.1987).
synergistic herbicidal combination:
- WO 9 105 469 (Hoechst AG; 2.5.1991; appl. 12.10.1990; D-prior. 18.10.1989).
preparation of benzoylcyclohexanedione herbicides:
- US 4 780 127 (Stauffer Chemical; 25.10.1988; appl. 30.6.1986; USA-prior. 25.3.1982).
- EP 186 118 (Stauffer Chemical; 2.7.1986; appl. 18.12.1985; USA-prior. 20.12.1984).
stable herbicidal compositions:
- WO 9 727 748 (Zeneca; 7.8.1997; appl. 3.2.1997; USA-prior. 2.2.1996).
NTBC is a drug marketed by Swedish Orphan Biovitrum International AB under the brand name Orfadin® and it is used to slow the effects of hereditary tyrosinemia type 1 (HT-1) in adult and pediatric patients. It has been approved by FDA and EMA in January 2002 and February 2005 respectively.
HT-1 disease is due to a deficiency of the final enzyme of the tyrosine catabolic pathway fumarylacetoacetate hydrolase. NTBC is a competitive inhibitor of 4-hydroxyphenylpyruvate dioxygenase (HPPD), an enzyme which precedes fumarylacetoacetate hydrolase. By inhibiting the normal catabolism of tyrosine in patients with HT-1, NTBC prevents the accumulation of the toxic intermediates maleylacetoacetate and fumarylacetoacetate, that in patients with HT-1 are converted to the toxic metabolites succinylacetone and succinylacetoacetate, the former inhibiting the porphyrin synthesis pathway leading to the accumulation of 5-aminolevulinate.
Usefulness of NTBC in the treatment of further diseases has also been documented. A non-comprehensive list is reported hereinafter.
Effectiveness of Orfadin® in the treatment of diseases where the products of the action of HPPD are involved (e.g., HT-1) has been described notably in EP0591275B1 corresponding to U.S. Pat. No. 5,550,165B1. Synthesis of NTBC is also described in this patent.
WO2011106655 reports a method for increasing tyrosine plasma concentrations in a subject suffering from oculocutaneous/ocular albinism, the method comprising administering to the subject a pharmaceutically acceptable composition comprising NTBC in the range of between about 0.1 mg/kg/day to about 10 mg/kg/day.
U.S. Pat. No. 8,354,451B2 reports new methods of combating microbial infections due to fungi or bacteria by means of administration to a subject of a therapeutically active amount of NTBC.
WO2010054273 discloses NTBC-containing compositions and methods for the treatment and/or prevention of restless leg syndrome (RLS).
EP1853241B1 claims the use of NTBC in the treatment of a neurodegenerative disease, notably Parkinson disease.
Introne W. J., et al., disclosed usefulness of nitisinone in the treatment of alkaptonuria (Introne W. J., et al., Molec. Genet. Metab., 2011, 103, 4, 307). The key step of the synthesis reported in EP0591275B1 (now propriety of Swedish Orphan Biovitrum International AB, SE), involves the reaction of 2-nitro-4-trifluromethylbenzoyl chloride and cyclohexane-1,3-dione in the presence of triethylamine and then use of acetone cyanohydrin in order to promote the rearrangement of the key intermediate enol ester. After washing and extraction from CH2Cl2, the crude product is recrystallized from ethyl acetate to get the desired 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione as a solid having a melting point of 88-94° C.
Another patent (U.S. Pat. No. 4,695,673) filed in name of Stauffer Chemical Company disclosed a process of synthesis of acylated 1,3-dicarbonyl compounds in which the intermediate enol ester is isolated prior to its rearrangement into the final product, said rearrangement making use of a cyanohydrin compound derived from alkali metal, methyl alkyl ketone, benzaldehyde, cyclohexanone, C2-C5aliphatic aldehyde, lower alkyl silyl or directly by using hydrogen cyanide.
Yet another patent (U.S. Pat. No. 5,006,158) filed in name of ICI Americas Inc. disclosed a process similar to the one disclosed in U.S. Pat. No. 4,695,673 wherein the intermediate enol ester was isolated prior to its rearrangement into the final product by use of potassium cyanide. Said reaction can optionally be done by concomitant use of a phase transfer catalyst such as Crown ethers. The preferred solvent for conducting such a reaction is 1,2-dichloroethane.
Still a further patent (EP0805791) filed in name of Zeneca Ltd disclosed an alternative synthesis of nitisinone involving the reaction of 1,3-cyclohexanedione and variously substituted benzoyl chloride in the presence of sodium or potassium carbonate in CH3CN or DMF. Best yields were obtained using CH3CN as solvent and sodium carbonate as the base. Reaction was performed at 55-57° C. in 17 hours.
It is well known that one of the problems of the actual drug formulation (i.e., Orfadin® capsules) is its chemical instability. Indeed, even if Orfadin® has to be stored in a refrigerator at a temperature ranging from 2° C. to 8° C., its shelf life is of only 18 months. After first opening, the in-use stability is a single period of 2 months at a temperature not above 25° C., after which it must be discarded. It will be evident that such storage conditions have an impact in the distribution chain of the medicine, in terms of costs and also in terms of logistics for the patient. Therefore, there is an urgent need of more stable formulations, both from a logistic supply chain point of view, and from the patient compliance point of view. Since the formulation of Orfadin® contains only the active ingredient and starch as excipient, relative instability may be attributed to the active pharmaceutical ingredient itself; in other words it can derive from the way it is synthesized and/or the way it is extracted from the reaction mixture, and/or the way it is finally crystallized. Furthermore, some impurities may contribute to render the final product less stable overtime. Consequently, it is of major importance to identify a process of synthesis and/or a crystallization method that enable the reliable production of a highly pure and stable product.
Impurities as herein-above mentioned can derive either from the final product itself (through chemical degradation) or directly from the starting materials/solvents used in the process of synthesis. Regarding the latter option, it is therefore primordial to ascertain that at each step, impurities are completely removed in order not to get them at the final stage, also considering that some of them could potentially be cyto/genotoxic.
The impurities correlated to nitisinone can be either derived from the starting materials themselves (i.e., impurities 1 and 2) or obtained as side products during the process of synthesis and/or under storage conditions (i.e., impurities 3 to 5) and are the following:
- 2-nitro-4-(trifluoromethyl) benzoic acid (Impurity no 1),
- 1,3-cyclohexanedione (CHD) (Impurity no 2),
- 4-(trifluoromethyl)salicylic acid (Impurity no 3),
- 2-[3-nitro-4-(trifluoromethyl)benzoyl]-1,3-cyclohexanedione (Impurity no 4), and
- 6-trifluoromethyl-3,4-dihydro-2H-xanthene-1,9-dione (Impurity no 5).
Impurity-2, impurity-3, and impurity-5 have been previously reported in WO2015101794. Strangely, impurity-4 has never been reported, even if it is an obvious side-product which can easily be formed during the coupling reaction between 1,3-cyclohexanedione and 2-nitro-4-(trifluoromethyl) benzoic acid, the latter being not 100% pure but containing some amount of regioisomer 3-nitro-4-(trifluoromethyl) benzoic acid.
Potential genotoxicity of impurity no 4 which possesses an aromatic nitro moiety was assessed using in-silico techniques and resulted to be a potential genotoxic impurity. According to the FDA ICH M7 guidelines, daily intake of a mutagenic impurity (Threshold of Toxicological Concern, TTC) in an amount not greater than 1.5 μg per person is considered to be associated with a negligible risk to develop cancer over a lifetime of exposure. Consequently, assuming a daily dose of 2 mg/kg, for a person weighing 70 kg, the maximum tolerated impurity content of such a compound would be of about 11 ppm, as calculated according to the equation underneath.
concentration limit ( ppm ) = T T C ( µg / day ) Dose ( g / day )
It is therefore of paramount importance to ensure that the process of synthesis of nitisinone and the purification steps of the same give rise to an API devoid of such impurity no 4, or at least far below the threshold of 11 ppm as indicated above. The skilled person will understand that total absence of said impurity is highly desirable.
It is well known in the pharmaceutical field that investigation of potential polymorphism of a solid API is of crucial importance and is also recommended by major regulatory authorities such as FDA.
Notwithstanding the fact that nitisinone has been used for years to treat HT-1 patients, it appears that no NTBC formulation fully satisfies the requisites of stability and/or compliance standard for the patients. Therefore, there is an unmet medical need of long-term pure and stable formulations.
Thionyl chloride (162 g, 1.36 mol) was added dropwise into a suspension of 2-nitro-4-trifluoromethylbenzoic acid (228 g, 0.97 mol) in toluene (630 g) at 80° C. The thus obtained solution was kept under stirring at 80° C. for 20 hours, and then cooled to 50° C. The volatiles were removed under reduced pressure in order to get the expected 2-nitro-4-trifluoromethylbenzoyl chloride as an oil. The latter, cooled to 25° C. was added dropwise to a suspension of 1,3-cyclohexanedione (109 g, 0.97 mol) and potassium carbonate (323 g, 2.33 mol) in CH3CN (607 g). After 18 h the mixture was diluted with water (500 ml) and slowly acidified to about pH=1 with HCl 37%. The mixture was then warmed to about 55° C. and the phases were separated. The organic layer was washed with a 10% aqueous solution of sodium chloride and then, concentrated under reduced pressure at a temperature below 55° C. to reach a volume of 380 ml. The thus obtained mixture was stirred at 55° C. for 1 h and then cooled to 0° C. in 16 to 18 h. The resulting solid was filtered and rinsed several times with pre-cooled (0° C.) toluene. The wet solid was dried at 60° C. under vacuum for 6 h to provide nitisinone (164 g) as a white to yellowish solid with a purity of 98.4% as measured by HPLC and a content of potentially genotoxic impurity no 4 of 6.1 ppm measured by HPLC/MS.
Nitisinone as obtained from example 1 (164 g) was added to a 3/1 (w/w) mixture of CH3CN/toluene (volume of solvent: 638 ml). The mixture was warmed gently to about 55° C. under stirring until solids were completely dissolved. The solution was then concentrated under reduced pressure maintaining the internal temperature below 50° C. to reach a volume of 290 ml. Then, more toluene (255 g) was added and the solution was concentrated again under reduced pressure until the residual volume reached 290 ml. The solution was heated to about 55° C. for 1 h and successively cooled slowly in 10 to 12 h to 10° C. The resulting solid was filtered and rinsed several times with pre-cooled (0° C.) toluene. The wet solid was dried at about 60° C. under vacuum for 4 h to provide nitisinone (136 g) as a white to yellowish solid, with a purity of 99.94% and a 99.8% assay measured by HPLC and a d(90) particle size between 310 and 350 μm. The content of potential genotoxic impurity no 4 resulted below 1 ppm.
- National Organization for Rare Disorders. Physician’s Guide to Tyrosinemia Type 1Archived 2014-02-11 at the Wayback Machine.
- “Nitisinone (Oral Route) Description and Brand Names”. Mayoclinic.com. 2015-04-01. Retrieved 2015-06-04.
- Sobi Orfadin® (nitisinone)
- McKiernan, Patrick J (2006). “Nitisinone in the Treatment of Hereditary Tyrosinaemia Type 1”. Drugs. 66 (6): 743–50. doi:10.2165/00003495-200666060-00002. PMID 16706549.
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- Kavana, Michael; Moran, Graham R. (2003). “Interaction of (4-Hydroxyphenyl)pyruvate Dioxygenase with the Specific Inhibitor 2-[2-Nitro-4-(trifluoromethyl)benzoyl]-1,3-cyclohexanedione†”. Biochemistry. 42 (34): 10238–45. doi:10.1021/bi034658b. PMID 12939152.
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- Pr Nitisinone Tablets Regulatory Decision Summary Health Canada, 2016. http://www.hc-sc.gc.ca/dhp-mps/prodpharma/rds-sdr/drug-med/rds-sdr-nitisinone-tab-193770-eng.php
- PrOrfadin Regulatory Decision Summary Health Canada, 2016. http://www.hc-sc.gc.ca/dhp-mps/prodpharma/rds-sdr/drug-med/rds-sdr-orfadin-193226-eng.php
|AHFS/Drugs.com||Consumer Drug Information|
|Elimination half-life||Approximately 54 h|
|Chemical and physical data|
|Molar mass||329.228 g/mol|
|3D model (JSmol)|
////////////////Nitisinone, ニチシノン , Orfadin, FDA 2002, NTBC , SC-0735 , SYN-118 , JAPAN 2015, JAP 2015, EU 2005, Priority, Orphan
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FDA Approves Ryanodex for the Treatment of Malignant Hyperthermia
WOODCLIFF LAKE, N.J.(BUSINESS WIRE) July 23, 2014 —
Eagle Pharmaceuticals, Inc. (“Eagle” or “the Company”)
(Nasdaq:EGRX) today announced that the U. S. Food and Drug Administration (FDA)
has approved Ryanodex (dantrolene sodium) for injectable
suspension indicated for
the treatment of malignant hyperthermia (MH), along
with the appropriate supportive measures.
MH is an inherited and potentially fatal disorder triggered
by certain anesthesia agents
in genetically susceptible individuals. FDA had designated
Ryanodex as an Orphan Drug in
August 2013. Eagle has been informed by the FDA that it will learn over the next four to
six weeks if it has been granted the seven year Orphan Drug market exclusivity.
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