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ORGANIC SPECTROSCOPY

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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 AFRICURE PHARMA, ROW2TECH, NIPER-G, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Govt. of India as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 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, 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 32 PLUS year tenure till date Feb 2023, 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 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, 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 38 lakh plus views on New Drug Approvals Blog in 227 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 He has total of 32 International and Indian awards

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Odentegravir


Odentegravir

CAS 2495436-99-0

MF C20H18F3N3O4 MW421.4 g/mol

(7S)-12-hydroxy-1,11-dioxo-N-[(2,4,6-trifluorophenyl)methyl]-1,4,5,6,7,11-hexahydro-3H-2,7-
methanopyrido [1,2-a][1,4]diazonine-10-carboxamide

(7S)-1,4,5,6,7,11-HEXAHYDRO-12-HYDROXY-1,11-DIOXO-N-((2,4,6-TRIFLUOROPHENYL)METHYL)-3H-2,7-METHANOPYRIDO(1,2-A)(1,4)DIAZONINE-10-CARBOXAMIDE
(7S)-12-HYDROXY-1,11-DIOXO-N-((2,4,6-TRIFLUOROPHENYL)METHYL)-1,4,5,6,7,11-HEXAHYDRO-3H-2,7-METHANOPYRIDO(1,2-A)(1,4)DIAZONINE-10-CARBOXAMIDE
3H-2,7-METHANOPYRIDO(1,2-A)(1,4)DIAZONINE-10-CARBOXAMIDE, 1,4,5,6,7,11-HEXAHYDRO-12-HYDROXY-1,11-DIOXO-N-((2,4,6-TRIFLUOROPHENYL)METHYL)-, (7S)-

antiviral, H8B26JZ4A4, orb2664247

Odentegravir is a small molecule drug classified as a

HIV integrase inhibitor, indicated by the “-tegravir” stem in its name. It is a chemical compound with the molecular formula

has been used in research for its antiviral properties. 

  • Drug Class: HIV integrase inhibitor
  • Chemical Formula: C20H18F3N3O4cap C sub 20 cap H sub 18 cap F sub 3 cap N sub 3 cap O sub 4𝐶20𝐻18𝐹3𝑁3𝑂4
  • Molecular Weight: 421.12421.12421.12 Da (monoisotopic)
  • Classification: Small molecule drug 

SYN

WO-2020197991

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020197991&_cid=P12-MHY8KB-06018-1

Example 23: Preparation of racemic-12-hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26), (7R)-12-hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-

methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26-1) and (7S)-12-hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26-2):

Synthesis of 12-Hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26):

[0335] 12-(Benzyloxy)-1,11-dioxo-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxylic acid (57 mg, 0.155 mmol) was dissolved in DCM (2 mL) with (2,4,6-trifluorophenyl)methanamine (27 mg, 0.17 mmol) and triethylamine (60 mg, 0.464 mmol). HATU (60 mg, 0.186 mmol) was added and the mixture was stirred at room

temperature. After overnight reaction, the reaction was concentrated to dryness, purified by silicon gel chromatography to obtain compound 12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a) MS (m/z) 512.06 [M+H]+.

[0336] Compound 12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a) (7 mg, 0.014 mmol) was dissloved in Tolune (1 mL), then followed by the addition of TFA (1 mL). The resulting mixture was stirred at rt for overnight. The solvent was removed under vacuo an the residue was purifed by HPLC to obtain the title compound (26). MS (m/z) 422.091 [M+H]+.1H NMR (400 MHz, DMSO-d6) d 10.39 (t, J = 5.8 Hz, 1H), 8.45 (s, 1H), 7.24 – 7.11 (m, 2H), 4.72 (dd, J = 5.9, 2.9 Hz, 1H), 4.54 (dd, J = 6.0, 2.4 Hz, 2H), 4.11 (d, J = 13.3 Hz, 1H), 3.88 – 3.79 (m, 1H), 3.64 (dd, J = 14.7, 1.9 Hz, 1H), 3.05 (dq, J = 9.5, 3.4 Hz, 1H), 2.06 – 1.91 (m, 1H), 1.89 – 1.74 (m, 3H), 1.61 (d, J = 7.7 Hz, 1H), 1.11 (d, J = 12.7 Hz, 1H).

Synthesis of (7S)-12-hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26-2) and (7R)-12-hydroxy-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26-1):

[0337] Racemic 12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a) was separated by chiral HPLC separation (SFC chromatography on an IB 4.6X100mm 5mic column using MeOH(20) as co-solvent) to obtain compounds (7R)-12-(Benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a-1) and (7S)-12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a-2)

[0338] Compound (7S)-12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a-2) (20 mg, 0.039 mmol) was dissloved in Tolune (1 mL), then followed by the addition of TFA (1 mL). The resulting mixture was stireed at rt for overnight. The solvent was removed under vacuo an the residue was purifed by HPLC to obtain the title compound (26-2). (MS (m/z) 422.123 [M+H]+1H NMR (400 MHz, DMSO-d6) d 10.59 (s, 1H), 10.39 (d, J = 5.9 Hz, 1H), 8.45 (s, 1H), 7.18 (t, J = 8.6 Hz, 2H), 4.72 (s, 1H), 4.59 – 4.48 (m, 2H), 4.11 (d, J = 13.2 Hz, 1H), 3.85 (d, J = 14.6 Hz, 1H), 3.69 – 3.59 (m, 1H), 3.05 (ddd, J = 11.3, 6.7, 3.6 Hz, 1H), 1.97 (m, 1H), 1.87 – 1.71 (m, 3H), 1.67 – 1.55 (m, 1H), 1.10 (m, 1H).

[0339] Compound (7R)-12-(benzyloxy)-1,11-dioxo-N-(2,4,6-trifluorobenzyl)-1,4,5,6,7,11-hexahydro-3H-2,7-methanopyrido[1,2-a][1,4]diazonine-10-carboxamide (26a-1) ((20 mg, 0.039 mmol) was dissloved in Tolune (1 mL), then followed by the addition of TFA (1 mL). The resulting mixture was stireed at rt for overnight. The solvent was removed under vacuo an the residue was purifed by HPLC to obtain the title compound (26-1). MS (m/z) 422.116 [M+H]+1H NMR (400 MHz, DMSO-d6) d 10.58 (s, 1H), 10.39 (t, J = 5.8 Hz, 1H), 8.45 (s, 1H), 7.18 (dd, J = 9.2, 8.0 Hz, 2H), 4.73 (s, 1H), 4.58 – 4.49 (m, 2H), 4.11 (d, J = 13.3 Hz, 1H), 3.85 (d, J = 14.6 Hz, 1H), 3.65 (d, J = 14.2 Hz, 1H), 3.10 – 3.00 (m, 1H), 1.96 (m, 1H), 1.82 (d, J = 12.2 Hz, 3H), 1.61 (d, J = 7.4 Hz, 1H), 1.18 – 1.05 (m, 1H).

SYN

WO-2023196875

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2023196875&_cid=P12-MHY8FJ-02517-1

PAT

str1

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//////Odentegravir, antiviral, H8B26JZ4A4, orb2664247