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
各种N-单取代的苯甲with与在2位上被甲基,乙基或甲氧基取代的4,4,4-三氟乙酰乙酸酯的直接反应可提供中等至良好收率的除草剂3-取代的-6-三氟甲基-4(3 H)-嘧啶酮。用相应的4,4-二氟乙酰乙酸酯得到较低的产率,而用未氟化的β-酮酯使反应失败。除苄am外,3-和4-吡啶甲car也成功反应。该反应容许the氮上的丙基,烯丙基,炔丙基和苯基取代基。