申请人:Singh Girij Pal
公开号:US20080171885A1
公开(公告)日:2008-07-17
The present invention provides an improved process for preparation of highly pure trandolapril. The process comprises of the following steps: (i) crystallization of mixture of racemic benzyl trans-(2S, 3aR, 7aS)-octahydro-1H-indole carboxylate p-toluene sulphonic acid salt (IIa.p-TsOH) and benzyl trans-(2R, 3aS, 7aR)-octahydro-1H-indole carboxylate p-toluene sulphonic acid salt (IIb.p-TsOH) through appropriate selection of solvents to enrich the purity to >99% from a mixture containing the other diastereomers (IIc-h.p-TsOH) up to 6%, (ii) optical resolution of racemic mixture of benzyl trans-(2S, 3aR, 7aS)-octahydro-1H-indole carboxylate (Na) and benzyl trans-(2R, 3aS, 7aR)-octahydro-1H-indole carboxylate (lib) with (−)-dibenzoyl-L-tartaric acid monohydrate in an appropriately selected solvents and temperature, (iii) reaction of benzyl ester Ma with N-[1-(S)-ethoxycarbonyl-3-phenylpropyl]-(S)-alanine N-carboxy anhydride (III a, NEPA-NCA hereafter) to get trandolapril benzyl ester (IVa), and finally (iv) crystallization of crude trandolapril from appropriate solvents.
本发明提供了一种改进的高纯度曲唑普利制备工艺。该工艺包括以下步骤:(i)通过适当选择溶剂结晶混合物的外消旋苯甲酸p-甲基苯磺酸盐(IIa.p-TsOH)和苯甲酸p-甲基苯磺酸盐(IIb.p-TsOH)以使纯度从含其他对映异构体(IIc-h.p-TsOH)高达6%的混合物中富集到> 99%,(ii)在适当选择的溶剂和温度下,用(-)-双苯酰-L-酒石酸单水合物对苯甲酸转-(2S,3aR,7aS)-八氢-1H-吲哚羧酸酯(Na)和苯甲酸转-(2R,3aS,7aR)-八氢-1H-吲哚羧酸酯(lib)进行光学分辨,(iii)将苯甲酸酯Ma与N- [1-(S)-乙氧羰基-3-苯基丙基] -(S)-丙氨酸N-羧酸酐(III a,以下简称NEPA-NCA)反应以得到曲唑普利苯甲酸酯(IVa),最后(iv)通过适当的溶剂结晶粗曲唑普利。