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 carbon center 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
已经开发了由铜(II)-双(恶唑啉)配合物催化的三氟亚乙基丙二酸酯对吲哚的对映选择性烷基化。以优异的收率(高达99%)和ee值(高达ee的96%)获得了具有带三氟甲基基团的立体异构叔碳中心的预期加合物。这种不对称催化反应的合成实用程序是由制备β-CF的证明3 -色氨酸和4-CF 3在高ee值-β-β-咔啉。