C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 277/48 (2006.01) A61K 31/425 (2006.01) A61K 45/06 (2006.01) C07D 277/42 (2006.01)
Patent
CA 2426122
A process for the preparation of a combination of Famotidine [Chemical Name (N- Sulfamyl - 3-(2-guanidinothiazole-4-yl-methylthio) proionamidine] Polymorphs A and B comprising the following steps:- (a) dissolving Famotidine crude in solvent such as methanol under heating and stirring to form a solution; (b) adding activated carbon to the solution of step (a) at 45°C for 30 minutes; (c) filtering the solution of step (a) to obtain a clear colourless solution; (d) concentrating the solution under vacuum at a temperature of 4.5°C to 58°C under vacuum to get a crystalline slurry; (e) filtering out the crystals of Famotidine Polymorphs A and B combination; (f) drying the said crystals of Famotidine Polymorphs A and B combination in an oven.
Sanyal Janardhan Prasad
Shah Mahesh Natwarial
Sriraman Mandayam Chakravarthy
Talia Yogen Hasmukhbhai
Vyas Jignesh Harikesh
Battison Williams Dupuis
M/s Tonira Pharma Limited
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