Bifunctional Quaternary Ammonium Salts Catalyzed Stereoselective Conjugate Addition of Oxindoles to Electron-Deficient β-Haloalkenes
作者:Qiaowen Jin、Changwu Zheng、Gang Zhao、Gang Zou
DOI:10.1021/acs.joc.7b00571
日期:2017.5.5
A highly Z-selective asymmetric conjugate addition of 3-substitutedoxindoles to β-haloalkene ketones/esters catalyzed by readily available chiral bifunctional quaternary ammonium salts is reported. This reaction provides efficient access to a range of 2-oxoindole derivatives bearing a thermodynamically unstable Z-olefin structure and a chiral quaternary carbon center in high yields (up to 90%) and