Process for the preparation of 3-acetoxy-2,3-dihydro-5- 2- (dimethylamino) ethyl -2- (p-methoxyphenyl) -1,5-benzothiazepin-4 (5H) -one hydrochloride

摘要

A process for preparing hydrochloride of 3-acetoxy-2,3-dihydro-5-[2-(dimethylamino)ethyl]-2-(p-methoxyphenyl)-1 ,5-benzothiazepin-4(5H)-one which comprises reacting 3-hydroxy-2,3-dihydro-5-[2-(dimethylamino)ethyl]-2-(p-methoxyphenyl)-1 ,5-benzothiazepin-4(5H)-one with acetyl chloride in acetic acid or a mixed solvent of acetic acid and acetic anhydride. According to the process, hydrochloride of 3-acetoxy-2,3-dihydro-5-[2-(dimethylamino)ethyl]-2-(p-methoxyphenyl)-1 ,5-benzothiazepin-4(5H)-one is readily obtained in one step.