氯乙酸甲酯 、 4-(2-chlorophenyl)-5-cyano-3-ethoxycarbonyl-6-sulfanyl-3,4-dihydropyridin-2-olate;4-methylmorpholin-4-ium 以
乙醇 为溶剂,
反应 3.0h,
以77%的产率得到(3R,4S)-4-(2-Chloro-phenyl)-5-cyano-6-methoxycarbonylmethylsulfanyl-2-oxo-1,2,3,4-tetrahydro-pyridine-3-carboxylic acid ethyl ester