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Tolebrutinib, SAR 442168



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2D chemical structure of 1971920-73-6



  • Treatment of Multiple Sclerosis (MS)

CAS 1971920-73-6

PRN 2246, example 3 [WO2016196840A1]







WHO 11268






2H-Imidazo(4,5-C)pyridin-2-one, 4-amino-1,3-dihydro-1-((3R)-1-(1-oxo-2-propen-1-yl)-3-piperidinyl)-3-(4-phenoxyphenyl)-


Tolebrutinib (R&D code SAR442168), developed by Principia and later acquired by Sanofi and included in its product line, Tolebrutinib is a BTK inhibitor used to treat cancer, autoimmune diseases such as multiple sclerosis and myasthenia gravis, inflammatory diseases and thromboembolic diseases, etc.,

Tolebrutinib is an orally bioavailable, brain-penetrant, selective, small molecule inhibitor of Bruton’s tyrosine kinase (BTK), with potential immunomodulatory and anti-inflammatory activities. Upon oral administration, tolebrutinib is able to cross the blood-brain barrier and inhibits the activity of BTK both peripherally and in the central nervous system (CNS). This prevents the activation of the B-cell antigen receptor (BCR) signaling pathway, and the resulting immune activation and inflammation. The inhibition of BTK activity also prevents microglial inflammatory signaling in the CNS, and the resulting immune activation, neuroinflammation and neurodegeneration. BTK, a cytoplasmic tyrosine kinase and member of the Tec family of kinases, plays an important role in B lymphocyte development, activation, signaling, proliferation and survival. In addition to B cells, BTK is also expressed in innate immune cells, including macrophages and microglia, and plays an important role in the regulation of microglial inflammatory signaling.

BTK, a member of the Tec family non-receptor tyrosine kinases, is essential for B cell signaling downstream from the B-cell receptor. It is expressed in B cells and other hematopoietic cells such as monocytes, macrophages and mast cells. It functions in various aspects of B cell function that maintain the B cell repertoire (see Gauld S. B. et al., B cell antigen receptor signaling: roles in cell development and disease. Science,

296: 1641 -2. 2002.) B cells pay a role in rheumatoid arthritis (see Perosa F., et ai, CD20-depleting therapy in autoimmune diseases: from basic research to the clinic. / Intern Med. 267:260-77. 2010 and Dorner T, et at. Targeting B cells in immune-mediated

inflammatory disease: a comprehensive review of mechanisms of action and identification of biomarkers. Pharmacol The 125:464-75. 2010 and Honigberg, L., et. ai, The selective BTK inhibitor PCI-32765 blocks B cell and mast cell activation and prevents mouse collagen indiced arthritis. Clin. Immunol. 127 SI :S 111. 2008) and in other autoimmune diseases such as systemic lupus erythematosus and cancers (see Shlomchik M. J., et. ai, The role of B cells in lpr/lpr-induced autoimmunity. /. Exp Med. 180:1295-1306. 1994; Honigberg L. A., The Braton tyrosine kinase inhibitor PCI-32765 blocks B-cell activation and is efficacious in models of autoimmune disease and B-cell malignancy. Proc. Natl. Acad. Sci. 107: 13075-80. 2010; and Mina-Osorio P, et al., Suppression of

glomerulonephritis in lupus-prone NZB x NZW mice by RN486, a selective inhibitor of Bruton’s tyrosine kinase. Arthritis Rheum. 65: 2380-91. 2013).

There is also potential for BTK inhibitors for treating allergic diseases (see Honigberg, L., et. al., The selective BTK inhibitor PCI-32765 blocks B cell and mast cell activation and prevents mouse collagen indiced arthritis. Clin. Immunol. 127 SI :S111. 2008). It was noted that the irreversible inhibitor suppresses passive cutaneous anaphylaxis (PCA) induced by IgE antigen complex in mice. These findings are in agreement with those noted with BTK-mutant mast cells and knockout mice and suggest that BTK inhibitors may be useful for the treatment of asthma, an IgE-dependent allergic disease of the airway.

Accordingly, compounds that inhibit BTK would be useful in treatment for diseases such as autoimmune diseases, inflammatory diseases, and cancer.




example 3 [WO2016196840A1]

Example 3

Synthesis of (R)-l-(l-acryloylpiperidin-3-yl)-4-amino-3-(4-phenoxyphenyl)-lH- imidazo[4,5-c]pyridin-2(3H)-one

Into a 100-mL round-bottom flask, was placed (R)-4-amino-3-(4-phenoxyphenyl)-l-(piperidin-3-yl)-lH-imidazo[4,5-c]pyridin-2(3H)-one (150 mg, 0.37 mmol, 1.00 equiv), DCM-CH30H (6 mL), TEA (113 mg, 1.12 mmol, 3.00 equiv). This was followed by the addition of prop-2-enoyl chloride (40.1 mg, 0.44 mmol, 1.20 equiv) dropwise with stirring at OoC in 5 min. The resulting solution was stirred for 2 h at 0 °C. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column with dichloromethane/methanol (30: 1). The crude product (100 mg) was purified by Prep-HPLC with the following conditions (Column, XBridge Prep CI 8 OBD

Column,5um, 19*150mm; mobile phase, water with 0.05%TFA and ACN (25.0% ACN up to 45.0% in 8 min). 54.5 mg product of (R)-l-(l -acryloylpiperidin-3-yl)-4-amino-3-(4-phenoxyphenyl)-lH-imidazo[4,5-c]pyridin-2(3H)-one was obtained as a white solid. LC-MS m/z: 465.2 (M+l)

Step 2

Into a 25-mL round-bottom flask was placed tert-butyl (3R)-3-[4-[(E)-[(dimethy]amino)-methylidene]-amino]-2-oxo-3-(4-phenoxyphenyl)-lH,2H,3H-imidazo[4,5-c]pyridin-l -yl]piperidine- l-carboxylate (150 mg, 0.27 mmol, 1.00 equiv), 1,4-dioxane (6 mL), and hydrogen chloride (3 mL). The resulting solution was stirred overnight at 50° C. The reaction mixture was quenched with water. The pH of the solution was adjusted to 9 with sodium bicarbonate. The resulting solution was extracted with dichloromethane:CH3OH=10: 1 and the organic layers were combined. The resulting mixture was washed with sodium chloride and the organic layers were combined, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column and eluted with dichloromethane/methanol (30: 1) to give 80 mg (74%) of 4-amino-3-(4-phenoxyphenyl)-l -[(3R)-piperidin-3-yl]-lH,2H,3H-imidazo[4,5-c]pyridin-2-one as a light yellow solid.


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/////////Tolebrutinib, SAR 442168, PRN 2246, GTPL10625BTK’168EX-A4699BDBM50557487WHO 11268,  Multiple Sclerosis,  (MS), 




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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, 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...... , 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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