The invention provides a novel process for the preparation of lercanidipine or a pharmaceutical acceptable salt using novel intermediates. Thus, 2,N-dimethyl-N-(3,3-diphenylpropy1)-1-amino-2-propanol is reacted with trimethylsilyl chloride in presence of triethyl amine in methylene chloride to give 2,N-dimethyl-2-(trimethylsilyloxy)-N-(3,3-diphenylpropy1)-1-propanamine, which is then reacted with 2,6-dimethyl-5-methoxycarbonyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3-carbonyl chloride for 2 hours and crystallized to obtain lercanidipine hydrochloride.
该发明提供了一种使用新型中间体制备lercanidipine或药物可接受盐的新工艺。因此,
2,N-二甲基-N-(3,3-二苯基丙基)-1-氨基-2-丙醇在
三乙胺存在下与三
甲基氯硅烷在
甲基氯中反应,得到2,N-二甲基-2-(三甲基
硅氧基)-N-(3,3-二苯基丙基)-
1-丙胺,然后与2,6-二甲基-5-甲氧羰基-4-(3-
硝基苯基)-1,4-
二氢吡啶-3-羧酰
氯反应2小时,并结晶得到lercanidipine盐酸盐。