(R)-2-Acetyl-4-{1-[(E)-(S)-2-(1-methoxy-1-methyl-ethyl)-pyrrolidin-1-ylimino]-ethyl}-3-(3,4,5-trimethoxy-phenyl)-pentanedioic acid 5-tert-butyl ester 1-ethyl ester 在
氯化铵 作用下,
以
甲醇 为溶剂,
反应 1.0h,
生成
(R)-2,6-Dimethyl-4-(3,4,5-trimethoxy-phenyl)-1,4-dihydro-pyridine-3,5-dicarboxylic acid 3-tert-butyl ester 5-ethyl ester 、 (S)-2,6-Dimethyl-4-(3,4,5-trimethoxy-phenyl)-1,4-dihydro-pyridine-3,5-dicarboxylic acid 3-tert-butyl ester 5-ethyl ester