[EN] IMPROVED PROCESS FOR THE PREPARATION OF NEBIVOLOL HYDROCHLORIDE<br/>[FR] PROCÉDÉ AMÉLIORÉ D'ÉLABORATION D'HYDROCHLORURE DE NÉBIVOLOL
申请人:MSN LAB LTD
公开号:WO2010089764A2
公开(公告)日:2010-08-12
An improved process for the preparation of nebivolol and its pharmaceutically acceptable salts is disclosed Concretely, the process involves a) esterifying 6-fluoro-3,4-dihydro-2H-l-benzopyran-2-carboxylic acid to provide alkyl 6-fluoro-3,4-dihydro-2H-l-benzopyran-2-carboxylate, b) reducing the alkyl 6-fluoro-3,4-dihydro-2H-l-benzopyran-2-carboxylate to provide 6-fluoro-3,4-dihydro-2H-l-benzopyran-2-carboxaldehyde, which is subsequently converted to 6-fluoro-3,4-dihydro-2-oxiranyl-2H-l-benzopyran, c) reacting 6-fluoro-3,4-dihydro-2-oxiranyl-2H-l-benzopyran with benzyl amine in a suitable solvent followed by treatment with suitable organic acid, and recrystalhzing the obtained compound to provide the corresponding organic acid salt of benzyl protected nebivolol, d) debenzylating the benzyl protected nebivolol salt, followed by treatment with hydrochloric acid to provide nebivolol hydrochloride