Trifluoroethoxy group as a leaving group for regioselective sequential substitution reactions of 5-trifluoromethylpyrimidine derivative with heteroatom nucleophiles
作者:Takumi Kagawa、Daiki Shigehiro、Kosuke Kawada
DOI:10.1016/j.jfluchem.2015.07.016
日期:2015.11
Highly regioselective substitution reaction of 2,4-bis(2,2,2-trifluoroethoxy)-5-(trifluoromethyl)pyrimidine (TFEFP) with aniline derivatives smoothly proceeded firstly at the 2-postion. For the subsequent nucleophilic substitution at the 4-position with alkoxides, trifluoroethoxy group at the 4-position serves as a practically efficient leaving group.
2,4-双(2,2,2-三氟乙氧基)-5-(三氟甲基)嘧啶(TFEFP)与苯胺衍生物的高度区域选择性取代反应首先在2-位顺利进行。对于随后在4-位用醇盐进行的亲核取代,在4-位的三氟乙氧基是实际上有效的离去基团。