Enantioselective, Copper-Catalyzed Alkynylation of Ketimines To Deliver Isoquinolines with α-Diaryl Tetrasubstituted Stereocenters
作者:Srimoyee Dasgupta、Jixin Liu、Clarissa A. Shoffler、Glenn P. A. Yap、Mary P. Watson
DOI:10.1021/acs.orglett.6b02787
日期:2016.12.2
An enantioselective, copper-catalyzed alkynylation of cyclic α,α-diaryl ketiminium ions has been developed to deliver isoquinoline products with diaryl, tetrasubstituted stereocenters. The success of this reaction relied on identification of Ph-PyBox as the optimal ligand, i-Pr2NEt as the base, and CHCl3 as the solvent. A broad scope and functional group tolerance were observed. Notably, the use of
已经开发出对映选择性的,铜催化的环状α,α-二芳基酮亚胺离子的炔基化,以递送具有二芳基,四取代的立体中心的异喹啉产物。该反应的成功依赖于确定Ph-PyBox为最佳配体,i -Pr 2 NEt为碱,CHCl 3为溶剂。观察到广泛的范围和功能组的耐受性。值得注意的是,同时使用芳基和甲硅烷基乙炔会导致高收率和对映选择性。机理实验与二聚或更高阶催化剂一致。