3,8-diphenyl-4-imino-2-methylthio-5-methyl-7-thioxo-3,4,7,8-tetrahydropyrido<2,3-d>pyrimidine-6-carboxylic acid ethyl ester 在
sodium hydroxide 作用下,
以
乙醇 为溶剂,
反应 3.0h,
以50%的产率得到3,8-diphenyl-4-imino-5-methyl-2-oxo-7-thioxo-1,2,3,4,7,8-hexahydropyrido<2,3-d>pyrimidine-6-carboxylic acid ethyl ester