4-(3-chlorophenyl)-6-methyl-2-(methylthio)-1,4-dihydropyrimidine-5-carboxylic acid ethylester 在
manganese dioxide silica gel 、
ethyl acetate n-hexane 作用下,
以
氯仿 为溶剂,
反应 2.0h,
生成
4-(3-chlorophenyl)-6-methyl-2-(methylthio)-5-pyrimidinecarboxylic acid ethylester