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DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 year tenure till date Dec 2017, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email amcrasto@gmail.com, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries......https://newdrugapprovals.wordpress.com/ , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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Picropodophyllin


Picropodophyllin.png

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2D chemical structure of 477-47-4

Picropodophyllin

Picropodophyllotoxin

CAS 477-47-4

AXL1717, NSC 36407, BRN 0099161

414.4 g/mol, C22H22O8

(5R,5aR,8aS,9R)-5-hydroxy-9-(3,4,5-trimethoxyphenyl)-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[5,6-f][1,3]benzodioxol-8-one

Furo(3′,4′:6,7)naphtho(2,3-d)-1,3-dioxol-6(5aH)-one, 5,8,8a,9-tetrahydro-9-hydroxy-5-(3,4,5-trimethoxyphenyl)-, (5R-(5-alpha,5a-alpha,8a-alpha,9-alpha))-

5-19-10-00665 (Beilstein Handbook Reference)

Axelar is developing picropodophyllin, a small-molecule IGF-1 receptor antagonist for the treatment of cancer including NSCLC and malignant astrocytoma. In February 2019, a phase Ia study was planned to initiate for solid tumor in March 2019.

Picropodophyllin is a cyclolignan alkaloid found in the mayapple plant family (Podophyllum peltatum), and a small molecule inhibitor of the insulin-like growth factor 1 receptor (IGF1R) with potential antineoplastic activity. Picropodophyllin specifically inhibits the activity and downregulates the cellular expression of IGF1R without interfering with activities of other growth factor receptors, such as receptors for insulin, epidermal growth factor, platelet-derived growth factor, fibroblast growth factor and mast/stem cell growth factor (KIT). This agent shows potent activity in the suppression o f tumor cell proliferation and the induction of tumor cell apoptosis. IGF1R, a receptor tyrosine kinase overexpressed in a variety of human cancers, plays a critical role in the growth and survival of many types of cancer cells.

Picropodophyllotoxin is an organic heterotetracyclic compound that has a furonaphthodioxole skeleton bearing 3,4,5-trimethoxyphenyl and hydroxy substituents. It has a role as an antineoplastic agent, a tyrosine kinase inhibitor, an insulin-like growth factor receptor 1 antagonist and a plant metabolite. It is a lignan, a furonaphthodioxole and an organic heterotetracyclic compound.

Picropodophyllin has been investigated for the treatment of Non Small Cell Lung Cancer.

One of the largest challenges in pharmaceutical drug development is that drug compounds often are poorly soluble, or even insoluble, in aqeous media. Insufficient drug solubility means insufficient bioavailability, as well as poor plasma exposure of the drug when administered to humans and animals. Variability of plasma exposure in humans is yet a problem when developing drugs which are poorly soluble, or even insoluble, in aqeous media.

It is estimated that between 40% and 70 % of all new chemical entities identified in drug discovery programs, are insufficiently soluble in aqeous media (M. Lindenberg, S et al: European Journal of Pharmaceutics and Biopharmaceuticals, vol. 58, no.2, pp. 265-278, 2004). Scientists have investigated various ways of solving the problem with poor drug solubility in order to enhance bioavailability of poorly absorbed drugs, aiming at increasing their clinical efficacy when administered orally.

Technologies such as increase of the surface area and hence dissolution may sometimes solve solubility problems. Other techniques that may also solve bioavailability problems are addition of surfactants and polymers. However, each chemical compound has its own unique chemical and physical properties, and hence has its own unique challenges when being formulated into a pharmaceutical product that can exert its clinical efficacy.

Picropodophyllin is an insulin-like growth factor-1 receptor inhibitor fiGF-lR inhibitor) small-molecule compound belonging to the class of compounds denominated cyclolignans, having the chemical structure:

The patent applicant is presently entering clinical phase II development with its development compound picropodophyllin (AXL1717). However, picropodophyllin is poorly soluble in aqueous media. In a phase I clinical study performed by the applicant in 2012 (Ekman S et al; Acta Oncologica, 2016; 55: pp. 140-148), it was discovered that picropodophyllin, when administered as an oral suspension to lung cancer patients, resulted in unacceptable variability in drug exposure. A large variability in plasma exposure of the active drug picropodophyllin occurred not only within certain patients, but also between several patients.

Yet a problem with administering picropodophyllin as an aqeous solution, is that due to the poor solubility in aqueous media, it is difficult or even impossible to reach the required therapeutic doses.

The compound picropodophyllin is furthermore physically unstable, and transforms from amorphous picropodophyllin into crystalline picropodophyllin. Yet a stability problem with picropodophyllin is that it is chemically unstable in solution.

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Product case, WO02102804

Patent

WO-2019130194

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019130194&tab=PCTDESCRIPTION&_cid=P10-JXYAA3-53049-1

Novel amorphous forms of picropodophyllin , processes for their preparation and compositions comprising them are claimed. Also claims are their use for treating cancers, such as neurologic cancer, lung cancer, breast cancer, head and neck cancer, gastrointestinal cancer, genitourinary cancer, gynecologic cancer, hematologic cancer, musculoskeletal cancer, skin cancer, endocrine cancer, and eye cancers. , claiming picropodophyllin derivatives as modulators of insulin-like growth factor-1 receptor (IGF-1), useful for treating cancers, assigned to Axelar AB ,

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CLIP

https://pubs.rsc.org/en/content/articlelanding/2004/cc/b312245j/unauth#!divAbstract

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http://www.rsc.org/suppdata/cc/b3/b312245j/b312245j.pdf

dH(CDCl3; 300 MHz; Me4Si): 2.64-2.78 (1 H, m, 3-H), 3.23 (1 H, dd, J 4.4 and 8.2, 2-H), 3.81 (6 H, s, 2 x OMe), 3.85 (3 H, s, OMe), 4.09 (1 H, d, J 4.4, 1-H), 4.38–4.59 (3 H, m, 11-H2 and 4-H), 5.91 (1 H, d, J 1.5, OCH2O), 5.93 (1 H, d, J 1.5, OCH2O), 6.35 (1 H, s, 5-H/8-H), 6.46 (1 H, s, 2’-H and 6’-H) and 7.07 (1 H, s, 5-H/8-H).

CLIP

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PAPER

Organic Letters (2018), 20(6), 1651-1654

https://pubs.acs.org/doi/abs/10.1021/acs.orglett.8b00408

Abstract Image

A nickel-catalyzed reductive cascade approach to the efficient construction of diastereodivergent cores embedded in podophyllum lignans is developed for the first time. Their gram-scale access paved the way for unified syntheses of naturally occurring podophyllotoxin and other members.

Synthesis of (−)-Podophyllotoxin (1)

https://pubs.acs.org/doi/suppl/10.1021/acs.orglett.8b00408/suppl_file/ol8b00408_si_001.pdf

The residue was purified by flash column chromatography (petroleum ether/EtOAc = 4 : 1 → petroleum ether/EtOAc = 2 : 1) on silica gel to afford 1 (8.6 mg, 87% yield) as a white solid; Rf = 0.23 (petroleum ether/EtOAc = 1 : 1); [α]20 D = –115.00 (c = 1.00, CHCl3) [ref.13: [α]20 D = –101.7 (c = 0.55, EtOH)]; Mp. 167–168 °C; 1H NMR (400 MHz, CDCl3): δ = 7.11 (s, 1H), 6.51 (s, 1H), 6.37 (s, 2H), 5.98 (s, 1H), 5.96 (s, 1H), 4.77 (t, J = 8.4 Hz, 1H), 4.60 (t, J = 8.0 Hz, 1H), 4.59 (d, J = 4.4 Hz, 1H), 4.08 (dd, J = 9.6, 8.8 Hz, 1H), 3.81 (s, 3H), 3.75 (s, 6H), 2.84 (dd, J = 14.0, 4.4 Hz, 1H), 2.83−2.74 (m, 1H), 2.13 (d, J = 8.0 Hz, 1H, −OH) ppm; 13C NMR (100 MHz, CDCl3): δ = 174.6, 152.5 (2C), 147.7, 147.6, 137.1, 135.5, 133.3, 131.0, 109.7, 108.4 (2C), 106.3, 101.4, 72.6, 71.4, 60.7, 56.2 (2C), 45.2, 44.1, 40.6 ppm.

https://pubs.acs.org/doi/suppl/10.1021/acs.orglett.8b00408/suppl_file/ol8b00408_si_002.pdf

PAPER

Organic Letters (2017), 19(24), 6530-6533

https://pubs.acs.org/doi/abs/10.1021/acs.orglett.7b03236

Abstract Image

he first catalytic enantioselective total synthesis of (−)-podophyllotoxin is accomplished by a challenging organocatalytic cross-aldol Heck cyclization and distal stereocontrolled transfer hydrogenation in five steps from three aldehydes. Reversal of selectivity in hydrogenation led to the syntheses of other stereoisomers from the common precursor.

https://pubs.acs.org/doi/suppl/10.1021/acs.orglett.7b03236/suppl_file/ol7b03236_si_001.pdf

(-)-Picropodophyllin 4. The lactone 5 (0.2 g, 0.38 mmol) was taken in 1-pentanol (5 mL) in a double neck RB flask at rt. Water (0.14 mL, 7.6 mmol) was added to above mixture and it was then degassed with argon followed by addition of Pd/C (0.04 g, 20% by wt.) and HCO2Na (0.78g, 11.4 mmol). The reaction mixture was heated at 40 °C for 12 h. On completion, the reaction mixture was diluted with EtOAc (200 mL), filtered through a celite pad and solvent was removed under vacuum. This crude mixture was dissolved in THF (3.8 mL), TBAF (1.9 mL, 1.9 mmol, 1M in THF) was added and stirred for 6 h at 27 °C. On completion, EtOAc (250 mL) was added, washed with water (100 mL), brine and dried over Na2SO4. After removal of solvent, the crude product was purified by column chromatography (hexanes-EtOAc, 3:2) to get the title compound as a white solid (0.082 g, 52%): Rf 0.32 (hexanes/EtOAc, 1:1); [α]25 D = -10.6 (c = 0.4, CHCl3) [lit. -10 (c = 0.3, CHCl3), -11 (c = 0.41, CHCl3)]3a,b;

Mp 214-216 °C; 1H NMR (600 MHz, CDCl3) δ 7.05 (s, 1H), 6.47 (s, 2H), 6.41 (s, 1H), 5.95 (d, J = 14.1 Hz, 2H), 4.5 (m, 2H), 4.44 (t, J = 8.0 Hz, 1H), 4.15 (d, J = 4.1 Hz, 1H), 3.86 (s, 3H), 3.83 (s, 6H), 3.24 (dd, J = 8.7, 5.0 Hz, 1H), 2.75 (m, 1H), 2.12 (s, 1H); 13C NMR (150 MHz, CDCl3) δ 177.6, 153.7, 147.5, 147.1, 139.3, 137.4, 131.9, 130.6, 109.3, 105.9, 105.5, 101.2, 69.8, 69.6, 60.9, 56.3, 45.4, 44.1, 42.7; HRMS (ESI-TOF) m/z 437.1219 [(M+Na)+ ; calcd for C22H22O8Na+ : 437.1212].

PAPER

The Journal of organic chemistry (2000), 65(3), 847-60.

https://pubs.acs.org/doi/abs/10.1021/jo991582+

Abstract Image

REF

Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen (1932), 65B, 1846.

Justus Liebigs Annalen der Chemie (1932), 499, 59-76.

Justus Liebigs Annalen der Chemie (1932), 494, 126-42.

Journal of the American Chemical Society (1954), 76, 5890-1

Helvetica Chimica Acta (1954), 37, 190-202.

 Journal of the American Chemical Society (1988), 110(23), 7854-8.

//////////////Picropodophyllin, AXL1717, NSC 36407, BRN 0099161, Picropodophyllotoxin, AXELAR, PHASE 1, CANCER, neurologic cancer, lung cancer, breast cancer, head and neck cancer, gastrointestinal cancer, genitourinary cancer, gynecologic cancer, hematologic cancer, musculoskeletal cancer, skin cancer, endocrine cancer, eye cancers,  NSCLC, malignant astrocytoma, SOLID TUMOUR

COC1=CC(=CC(=C1OC)OC)C2C3C(COC3=O)C(C4=CC5=C(C=C24)OCO5)O

Podofilox, Podophyllotoxin, Wartec, Condyline, Condylox

J Org Chem 2000,65(3),847

The formylation of 6-bromo-1,3-benzodioxole-5-carbaldehyde dimethyl acetal (I) with BuLi and DMF gives the 6-formyl derivative (II), which is reduced with NaBH4 in ethanol to yield the corresponding carbinol (III). The cyclization of (III) with dimethyl acetylenedicarboxylate (V) in hot acetic acid (through the nonisolated intermediate (IV)) affords dimethyl 1,4-epoxy-6,7-(methylenedioxy)naphthalene-2,3-dicarboxylate (VI), which is hydrogenated with H2 over Pd/C in ethyl acetate to give the (1R*,2S*,3R*,4S*)-tetrahydro derivative (VII). The reduction of (VII) with LiAlH4 in refluxing ethyl ether affords the corresponding bis carbinol (VIII), which is treated with acetic anhydride to afford the diacetate (IX). The enzymatic monodeacetylation of (VIII) with PPL enzyme in DMSO/buffer gives (1R,2R,3S,4S)-2-(acetoxymethyl)-1,4-epoxy-3-(hydroxymethyl)-6,7-(methylenedioxy)-1,2,3,4-tetrahydronaphthalene (X), which is silylated with TBDMS-Cl and imidazole in DMF yielding the silyl ether (XI). The hydrolysis of the acetoxy group of (XI) with K2CO3 in methanol affords the carbinol (XII), which is oxidized with oxalyl chloride in dichloromethane affording the carbaldehyde (XIII). The exchange of the silyl protecting group of (XIII) (for stability problems) provided the triisopropylsilyl ether (XIV), which is treated with sodium methoxide in methanol to open the epoxide ring yielding the hydroxy aldehyde (XV). The protection of the hydroxy group of (XV) with 2-(trimethylsilyl)ethoxymethyl chloride and DIEA in dichloromethane provides the corresponding ether (XVI). The carbinol (III) can also be obtained directly from 6-bromo-1,3-benzodioxole-5-carbaldehyde dimethyl acetal (I) by reaction with formaldehyde and BuLi in THF.

The oxidation of the aldehyde group of (XVI) with NaClO2 in tert-butanol affords the corresponding carboxylic acid (XVII), which is condensed with 2-oxazolidinone (XVIII) by means of carbonyldiimidazole (CDI) in THF to give the acyl imidazolide (XIX). The arylation of (XIX) with 3,4,5-trimethoxyphenylmagnesium bromide (XX) in THF yields the expected addition product (XXI), which is cyclized by means of TBAF in hot THF to afford the tetracyclic intermediate (XXII). Isomerization of the cis-lactone ring of (XXII) with LDA in THF affords intermediate (XXIII) with its lactone ring with the correct trans-conformation. Finally, this compound is deprotected with ethyl mercaptane and MgBr2 in ethyl ether to provide the target compound.

Synthesis 1992,719

The intermediate trans-8-oxo-5-(3,4,5-trimethoxyphenyl)-5,6,7,8-tetra-hydronaphtho[2,3-d][1,3]benzodioxole-6-carboxylic acid ethyl ester (XI) has been obtained by several different ways: (a) The condensation of benzophenone (XXXVIII) with diethyl malonate (XXXIX) by means of t-BuOK gives the alkylidenemalonate (XL), which is hydrogenated with H2 over Pd/C to the alkylmalonate hemiester (XLI). The reaction of (XLI) with acetyl chloride affords the mixed anhydride (XLII), which is finally cyclized to the target (XI) by means of SnCl4. (b) The cyclization of the malonic ester derivative (XLIII) by means of Ti(CF3–CO2)3 gives the 5-(3,4,5-trimethoxyphenyl)-5,6,7,8-tetrahydronaphtho [2,3-d][1,3]dioxole-6,6-dicarboxylic acid dimethyl ester (XLIV), which is finally oxidized and decarboxylated with NBS and NaOH in methanol to afford the target intermediate (XI). (c) The cyclization of the benzylidenemalonate (XLV) with the aryllithium derivative (XLVI) gives the 8-methoxy-5-(3,4,5-trimethoxyphenyl)-5,6,7,8-tetrahydronaphtho[2,3-d][1,3]dioxole-6,6-dicarboxylic acid dimethyl ester (XLVII), which is demethylated with TFA and oxidized with CrO3 and pyridine to the target compound (XI). (d) The cyclopropanation of the chalcone (XLVIII) with (ethoxycarbonyl) (dimethylsulfonium)methylide (XLIX) gives the cyclopropanecarboxylate (L), which is finally rearranged with BF3/Et2O to the target intermediate (IX).

The cyclization of 3,4,5-trimethoxycinnamic acid ethyl ester (LI) with malonic acid ethyl ester potassium salt (LII) by means of Mn(OAc)3 gives the tetrahydrofuranone (LIII), which is acylated with 1,3-benzodioxol-5-ylcarbonyl chloride (LIV) yielding the tetrahydrofuranone (LV). Finally, this compound is rearranged and decarboxylated with SnCl4 to the target intermediate (XI).

The cyclization of 6-[1-hydroxy-1-(3,4,5-trimethoxyphenyl)methyl]-1,3-benzodioxol-5-carbaldehyde dimethylacetal (LVI) by means of AcOH gives 5-(3,4,5-trimethoxyphenyl)-1,3-dioxolo[4,5-f]isobenzofuran (LVII), which is submitted to a Diels-Alder cyclization with acetylenedicarboxylic acid dimethyl ester (LVIII) yielding the epoxy derivative (LIX). The selective reduction of (LIX) with LiBEt3H and H2 affords the carbinol (LX), which is treated with H2 over RaNi in order to open the epoxide ring to give the diol (LXI) with the wrong configuration at the secondary OH group. The treatment of (LXI) with aqueous acid isomerizes the secondary OH group to (LXII) with the suitable configuration. Finally, this compound is cyclized with DCC to the desired target compound.

The Diels-Alder cyclization of 5-(3,4,5-trimethoxyphenyl)-7H-pyrano[3,4-f][1,3]benzodioxol-7-one (I) with dimethyl maleate (LXIII) gives the expected adduct (LXIV), which by thermal extrusion of CO2 yields the dihydronaphthodioxole (LXV). This compound is then converted to dihydroxycompound (X), which is finally cyclized by means of ZnCl2 to provide the target compound. The Diels-Alder cyclization of 5-(3,4,5-trimethoxyphenyl)-7H-pyrano[3,4-f][1,3]benzodioxol-7-one (I) with dimethyl fumarate (LXVI) gives the expected adduct (LXVII), which by hydrogenation with H2 over Pd/C yields the tricarboxylic acid derivative (LXVIII). The reaction of (LXVIII) with Pb(OAc)4 affords the acetoxy derivative (LXIX), which is selectively reduced with LiBEt3H providing the diol (LXI) with the wrong configuration at the secondary OH group. The treatment of (LXI) with aqueous acid isomerizes the secondary OH group to give the previously described (X) with the suitable configuration.

The reaction of benzocyclobutane derivative (LXX) with isocyanate (LXXI) by means of Ph3SnOAc gives the carbamate (LXXII), which is cyclized by a thermal treatment with LiOH yielding the tetracyclic carboxylic acid (LXXIII). The opening of the oxazinone ring of (LXXIII) in basic medium affords the tricyclic amino acid (LXXIV), which is finally cyclized to the target compound by reaction with sodium nitrite in acidic medium (pH = 4).

J Chem Soc Chem Commun 1993,1200

The Diels-Alder cyclization of 5-(3,4,5-trimethoxyphenyl)-7H-pyrano[3,4-f][1,3]benzodioxol-7-one (I) with the chiral dihydrofuranone (II) in hot acetonitrile gives the pentacyclic anhydride (III), which is opened with warm acetic acid yielding the carboxylic acid (IV). Hydrogenation of the benzylic double bond of (IV) with H2 over Pd/C affords (V), which is treated with lead tetraacetate and acetic acid in THF to give the acetoxy compound (VI). The hydrolysis of the acetoxy group and the menthol hemiacetal group with HCl in hot dioxane yields the diol (VII), which is treated with diazomethane in ether/methanol affording the aldehyde (VIII). The reduction of the aldehyde group of (VIII) with LiEt3BH in THF gives the diol (IX) as a diastereomeric mixture, which is treated with HCl in THF to afford the diol (X) with the right conformation. Finally, this compound is lactonized to the target compound with ZnCl2 in THF.

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