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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 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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SELGANTOLIMOD

July 25, 2020 9:07 am / Leave a comment


2D chemical structure of 2004677-13-6

SELGANTOLIMOD

GS 9688

RN: 2004677-13-6
UNII: RM4GJT3SMQ

Molecular Formula, C14-H20-F-N5-O,

Molecular Weight, 293.344

1-Hexanol, 2-((2-amino-7-fluoropyrido(3,2-d)pyrimidin-4-yl)amino)-2-methyl-, (2R)-

(2R)-2-((2-Amino-7-fluoropyrido(3,2-d)pyrimidin-4-yl)amino)-2-methylhexan-1-ol

gs

Discovery of GS–9688 (Selgantolimod) as a Potent and Selective Oral Toll-Like Receptor 8 Agonist for the Treatment of Chronic Hepatitis B
Journal of Medicinal Chemistry, Articles ASAP (Drug Annotation)

Publication Date (Web):May 14, 2020DOI: 10.1021/acs.jmedchem.0c00100

https://pubs.acs.org/doi/suppl/10.1021/acs.jmedchem.0c00100/suppl_file/jm0c00100_si_002.pd
PATENTS
Patent ID Title Submitted Date Granted Date
US2019192504 Therapeutic heterocyclic compounds 2018-08-20
US2017281627 TOLL LIKE RECEPTOR MODULATOR COMPOUNDS 2017-04-25
US2017071944 MODULATORS OF TOLL-LIKE RECEPTORS FOR THE TREATMENT OF HIV 2016-09-13
US9670205 TOLL LIKE RECEPTOR MODULATOR COMPOUNDS 2016-03-02

Patent

https://patentscope.wipo.int/search/en/detail.jsf?docId=US178076456&tab=PCTDESCRIPTION&_cid=P21-KD1F9D-27923-1

EXAMPLE 63


 (MOL) (CDX)
      Synthesis of methyl 2-amino-2-methylhexanoate (63A. To a mixture of (2R)-2-amino-2-methylhexanoic acid hydrochloride (50 mg, 0.28 mmol) and (2S)-2-amino-2-methylhexanoic acid hydrochloride (50 mg, 0.28 mmol) in MeOH (5.0 mL) was added (trimethylsilyl) diazomethane in hexanes (2 M, 0.41 mL, 0.83 mmol) dropwise. After 6 h, the reaction was quenched with AcOH (100 μL). The mixture was concentrated in vacuo to provide 63A that was used without further isolation. LCMS (m/z): 159.91 [M+H] +; t R=0.57 min. on LC/MS Method A.
      Synthesis of methyl 2-((2-((2,4-dimethoxybenzyl)amino)-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexanoate (63B). To a solution of 84E (120 mg, 0.55 mmol) in THF (5 mL) was added 63A (88 mg, 0.55 mmol) and N,N-diisopropylethylamine (0.3 mL, 1.7 mmol). After stirring at 80° C. for 18 h, the reaction was cooled to rt, diluted with EtOAc (50 mL), washed with water (50 mL) and brine (50 mL), dried over Na 2SO 4, then filtered and concentrated in vacuo. The crude residue was then diluted with THF (10 mL) and 2,4-dimethoxybenzylamine (0.4 mL, 2.6 mmol) and N,N-diisopropylethylamine (0.3 mL, 1.7 mmol) were added. After stirring at 100° C. for 18 h, the reaction was cooled to rt, diluted with EtOAc (50 mL), washed with water and brine, dried over Na 2SO 4, then filtered and concentrated in vacuo. The residue was subjected to silica gel chromatography eluting with hexanes-EtOAc to provide 63B. 1H NMR (400 MHz, Chloroform-d) δ 8.14 (d, J=2.5 Hz, 1H), 7.36 (s, 1H), 7.28-7.24 (m, 2H), 6.46 (d, J=2.3 Hz, 1H), 6.41 (dd, J=8.3, 2.4 Hz, 1H), 4.54 (dd, J=6.2, 2.7 Hz, 2H), 3.84 (s, 3H), 3.78 (s, 3H), 3.69 (s, 3H), 2.27-2.16 (m, 1H), 2.02 (s, 1H), 1.71 (s, 3H), 1.34-1.23 (m, 5H), 0.88 (t, J=6.9 Hz, 3H). 19F NMR (376 MHz, Chloroform-d) δ −121.51 (d, J=422.9 Hz). LCMS (m/z): 472.21 [M+H] +; t R=0.91 min. on LC/MS Method A.
      Synthesis of 2-((2-((2,4-dimethoxybenzyl)amino)-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol (63C). To a solution of 63B (104 mg, 0.22 mmol) in THF (5 mL) was added lithium aluminum hydride in Et 2O (2M, 0.30 mL, 0.60 mmol). After 5 h the reaction was quenched with H 2O (1 mL) and 2M NaOH (aq), and then filtered. The mother liquor was then diluted with EtOAc (30 mL), washed with sat. Rochelle’s salt solution (25 mL), H 2O (25 mL), and brine (25 mL), dried over Na 2SO 4, then filtered and concentrated in vacuo. The residue was subjected to silica gel chromatography eluting with hexanes-EtOAc to provide 63C. 1H NMR (400 MHz, Chloroform-d) δ 8.12 (d, J=2.5 Hz, 1H), 7.32 (s, 1H), 7.28 (s, 1H), 6.46 (d, J=2.4 Hz, 1H), 6.42 (dd, J=8.2, 2.4 Hz, 1H), 4.57-4.52 (m, 2H), 3.84 (s, 3H), 3.79 (s, 4H), 3.75 (s, 2H), 1.92 (d, J=14.1 Hz, 1H), 1.74 (t, J=12.6 Hz, 1H), 1.40-1.37 (m, 3H), 1.32 (td, J=13.4, 12.4, 6.3 Hz, 4H), 0.91 (t, J=7.0 Hz, 3H). 19F NMR (377 MHz, Chloroform-d) δ −121.34. LCMS (m/z): 444.20 [M+H] +; t R=0.94 min. on LC/MS Method A
      Synthesis of 2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol (63). To 63C (22 mg, 0.05 mmol) was added TFA (3 mL). After 30 minutes, the reaction mixture was diluted with MeOH (5 mL). After stirring for 18 h, the mixture was filtered and concentrated in vacuo. Co-evaporation with MeOH (×3) provided 63 as a TFA salt. 1H NMR (400 MHz, MeOH-d 4) δ 8.53 (d, J=2.4 Hz, 1H), 8.20 (s, 1H), 7.65 (dd, J=8.8, 2.4 Hz, 1H), 3.95 (s, 1H), 3.70 (d, J=11.2 Hz, 1H), 2.09 (ddd, J=13.9, 10.9, 5.3 Hz, 1H), 1.96-1.86 (m, 1H), 1.53 (s, 3H), 1.42-1.28 (m, 6H), 0.95-0.87 (m, 3H). 19F NMR (377 MHz, MeOH-d 4) δ −77.47, −118.23 (d, J=8.6 Hz). LCMS (m/z): 294.12 [M+H] +; t R=0.68 min. on LC/MS Method A.

EXAMPLE 64


 (MOL) (CDX)
      Synthesis of (S)-2-amino-2-methylhexan-1-ol (64A). To (2S)-2-amino-2-methylhexanoic acid hydrochloride (250 mg, 1.4 mmol, supplied by Astatech) in THF (5 mL) was added borane-tetrahydrofuran complex solution in THF (1M, 5.5 mL) dropwise over 5 minutes. After 24 h, the reaction was quenched with MeOH (1 mL) and concentrated in vacuo. The residue was taken up in DCM (10 mL), filtered, and concentrated in vacuo to provide crude 64A. LCMS (m/z): 131.92 [M+H] +; t R=0.57 min. on LC/MS Method A.
      Synthesis of (S)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol (64). To a solution of 43B (140 mg, 78 mmol) and 64A (125 mg, 0.95 mmol) in NMP (7.5 mL), was added DBU (0.35 mL, 2.4 mmol) followed by BOP (419 mg, 0.95 mmol). After 16 h, the reaction mixture was subjected to prep HPLC (Gemini 10u C18 110A, AXIA; 10% aq. acetonitrile—50% aq. acetonitrile with 0.1% TFA, over 20 min. gradient) to provide, after removal of volatiles in vacuo, 64 as a TFA salt. 1H NMR (400 MHz, MeOH-d 4) δ 8.55 (d, J=2.4 Hz, 1H), 8.22 (s, 1H), 7.64 (dd, J=8.7, 2.5 Hz, 1H), 3.97 (d, J=11.2 Hz, 1H), 3.71 (d, J=11.2 Hz, 1H), 2.09 (ddd, J=13.9, 10.8, 5.2 Hz, 1H), 1.92 (ddd, J=13.6, 10.9, 5.4 Hz, 1H), 1.54 (s, 4H), 1.40-1.31 (m, 5H), 1.00-0.85 (m, 3H). 19F NMR (377 MHz, MeOH-d 4) δ −77.62, −118.22 (d, J=8.7 Hz). LCMS (m/z) 294.09 [M+H] +; t R=0.79 min. on LC/MS Method A.

EXAMPLE 65


 (MOL) (CDX)
      Synthesis of (R)-N-(2-((2-amino-7-chloropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexyl)acetamide (65A). To a solution of 19B (112 mg, 0.48 mmol) in THF (5 mL) was added 61E (100 mg, 0.48 mmol) and N,N-diisopropylethylamine (0.25 mL, 1.4 mmol). After stirring at 80° C. for 18 h, 2,4-dimethoxybenzylamine (0.75 mL, 5.0 mmol) was added and the mixture was heated to 100° C. After 18 h, the reaction was cooled to rt, diluted with EtOAc (50 mL), washed with water (50 mL) and brine (50 mL), dried over Na 2SO 4, then filtered and concentrated in vacuo. The residue was subjected to silica gel chromatography eluting with hexanes-EtOAc to provide 65A LCMS (m/z): 509.30[M+H] +; t R=0.89 min. on LC/MS Method A.
      Synthesis of (R)-N-(2-((2-amino-7-chloropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexyl)acetamide (65). To 65A (21 mg, 0.04 mmol) was added TFA (3 mL). After 30 minutes, the mixture was concentrated in vacuo and the residue co-evaporated with MeOH (10 mL×3). The resulting residue was suspended in MeOH (10 mL), filtered, and concentrated in vacuo to provide 65 as a TFA salt. 1H NMR (400 MHz, MeOH-d 4) δ 8.59 (d, J=2.1 Hz, 1H), 8.58 (s, 1H), 7.91 (d, J=2.1 Hz, 1H), 3.93 (d, J=14.0 Hz, 1H), 3.52 (d, J=14.0 Hz, 1H), 2.22-2.10 (m, 1H), 1.96 (s, 3H), 1.95-1.87 (m, 1H), 1.54 (s, 3H), 1.34 (dd, J=7.5, 3.9 Hz, 5H), 0.94-0.89 (m, 3H). 19F NMR (377 MHz, MeOH-d 4) δ −77.91. LCMS (m/z): 351.29 [M+H] +; t R=0.69 min. on LC/MS Method A.

 

 

/////////////GS 9688, SELGANTOLIMOD

CCCC[C@@](C)(CO)Nc1nc(N)nc2cc(F)cnc12

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