Process for preparing pharmacologically acceptable salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl amino acids
申请人:Kaneka Corporation
公开号:US06335453B1
公开(公告)日:2002-01-01
There is provided a process for preparing a pharmacologically acceptable salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid which comprises condensing an amino acid and N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanine.N-carboxyanhydride under basic condition, carrying out decarboxylation under between neutral and acidic condition to obtain N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid, and forming a pharmacologically acceptable salt thereof,
wherein the production of a by-product (3):
is suppressed by carrying out in an aqueous liquid a series of operations till formation of the pharmacologically acceptable salt or till isolation of the pharmacologically acceptable salt. The present invention enables to prepare the pharmacologically acceptable salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid having high quality, in a commercial scale with high yield and economical efficiency.
Stereochemical investigations on the diketopiperazine derivatives of enalapril and lisinopril by NMR spectroscopy
作者:Ádám Demeter、Tamás Fodor、János Fischer
DOI:10.1016/s0022-2860(98)00399-8
日期:1998.11
Abstract Stereochemical analysis of epimeric diketopiperazine (DKP) derivatives of enalapril and lisinopril has been performed by NMR spectroscopy. The present study focuses on the configurational assignment and conformational characteristics of the epimeric DKPs obtained from cyclization and subsequent base-catalyzed hydrolysis. We report full 1 H and 13 Cassignments as obtained by a concerted use
摘要已通过核磁共振光谱对依那普利和赖诺普利的差向异构二酮哌嗪 (DKP) 衍生物进行立体化学分析。本研究的重点是通过环化和随后的碱催化水解获得的差向异构 DKP 的构型分配和构象特征。我们报告了通过协同使用 1D 和 2D 方法获得的完整 1 H 和 13 C 分配。各个立体中心的配置和主要构象特征来自测量的标量和 NOE 连接。侧链的一个显着构象特征是它倾向于在哌嗪二酮环上弯曲。