Abstract:
The present invention relates to an improved and industrially advantageous process for the preparation of N,N-dimethyl-3-(4-methyl)benzoyl propionamide of Formula I, which is a key intermediate in the synthesis of zolpidem hemitartrate, a non-benzodiazepine hypnotic agent. The process includes reacting 3-(4-methyl)-benzoyl propionic acid of Formula IV, with alkyl chloroformate or pivaloyl chloride to get a mixed anhydride of Formula V; and reacting the mixed anhydride of Formula V with dimethylamine of Formula VI to get the N,N-dimethyl-3-(4-methyl)benzoyl propionamide of Formula I.
Abstract:
An improved and efficient process for the preparation of 2-[3-cyano-4-(2-methylpropoxy)phenyl]-4-methylthiazole-5-carboxylic acid (febuxostat) that is substantially free from amide by-product is provided.
Abstract:
The present invention provides a process for the preparation of sorafenib tosylate, comprising contacting sorafenib free base with p-toluenesulphonic acid in water.
Abstract:
The present invention relates to a process for the preparation of cis-intermediate of Formula II, which is useful synthetic intermediates in the preparation of tadalafil.
Abstract:
The present invention relates to a process for preparation of erlotinib of Formula I or its pharmaceutically acceptable salt thereof. The present invention also relates to process for the preparation of erlotinib trifluoroacetate. The present invention also relates to a nove-ICrystalline form of erlotinib trifluoroacetate designated as Form E and process for its preparation. The present invention further relates to process for the preparation of erlotinib hydrochloride from erlotinib trifluoroacetate.
Abstract:
The invention relates to crystalline barium salt of (S)-omeprazole, which is (S)-5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl]sulfinyl]-1H-benzimidazole. The invention also relates to processes for preparing crystalline barium salt of (S)-omeprazole and pharmaceutical compositions that include the crystalline barium salt of (S)-omeprazole so prepared.
Abstract:
The present invention provides a process for preparation of crystalline aprepitant having not more than 15% by weight of Form I content which comprises, a) dissolving aprepitant in a suitable solvent to obtain a solution, b) cooling the solution to 10-15° C., c) optionally seeding the solution with aprepitant Form I crystals, d) adding an anti-solvent to the solution, and e) isolating crystalline aprepitant having not more than 15% by weight of Form I content.