Enantioselective Friedel−Crafts Alkylation of Indoles with Trifluoroethylidene Malonates by Copper−Bis(oxazoline) Complexes: Construction of Trifluoromethyl-Substituted Stereogenic Tertiary Carbon Center
作者:Lele Wen、Qilong Shen、Xiaolong Wan、Long Lu
DOI:10.1021/jo1024333
日期:2011.4.1
An enantioselective alkylation of indoles with trifluoroethylidene malonates catalyzed by copper(II)−bis (oxazoline) complexes has been developed. The expected adducts with a stereogenic tertiary carboncenter bearing a trifluoromethyl group were obtained in excellent yields (up to 99%) and ee values (up to 96% ee). The synthetic utility of this asymmetric catalytic reaction was demonstrated by the