Regiocontrolled synthesis of 3-substituted-6-trifluoromethyl-4(3H)-pyrimidinones
作者:Colin M Tice、Lois M Bryman
DOI:10.1016/s0040-4020(01)00042-4
日期:2001.4
Direct reaction of a variety of N-monosubstituted benzamidines with 4,4,4-trifluoroacetoacetate esters substituted at the 2-position with methyl, ethyl or methoxy afforded moderate to good yields of herbicidal 3-substituted-6-trifluoromethyl-4(3H)-pyrimidinones. Lower yields were obtained with the corresponding 4,4-difluoroacetoacetate esters and the reaction failed with nonfluorinated β-ketoesters