The practical resolution of (2RS,3RS)-2-hydroxy-3-(4-methoxyphenyl)-3-(2-nitrophenylthio)propionic acid, a key intermediate for diltiazem, with L-lysine.
作者:Masaru SENUMA、Masataka SHIBAZAKI、Shigeru NISHIMOTO、Keijiroh SHIBATA、Kimio OKAMURA、Tadamasa DATE
DOI:10.1248/cpb.37.3204
日期:——
Practical resolution of (2RS, 3RS)-2-hydroxy-3-(4-methoxyphenyl)-3-(2-nitrophenylthio)propionic acid (2) was examined by the use of several basic amino acids. L-Lysine was found to be the most effective resolving agent to obtain (+)-(2S, 3S)-2, a key intermediate for the synthesis of diltiazem (1). This new method should be applicable to the industrial production of 1 in view of the simplicity of the procedure, the ready availability of L-lysine, and the high yield of the desired isomer. The absolute stereochemistry of (+)-2 was determined to be 2S, 3S by X-ray crystallographic analysis.
通过使用几种基本氨基酸,对(2RS, 3RS)-2-羟基-3-(4-甲氧基苯基)-3-(2-硝基苯硫)丙酸(2)的实际分离进行了研究。结果发现,L-赖氨酸是获得(+)-(2S, 3S)-2的最有效的分离剂,(+)-(2S, 3S)-2是合成地尔硫卓(1)的关键中间体。考虑到该方法的简便性、L-赖氨酸的易得性以及所需异构体的高产率,这种新方法应适用于1的工业生产。通过X射线晶体学分析,确定(+)-2的绝对立体化学构型为2S, 3S。