Chincona Alkaloid-Catalyzed Enantioselective Trifluoromethylthiolation of Oxindoles
作者:Tao Yang、Qilong Shen、Long Lu
DOI:10.1002/cjoc.201400392
日期:2014.8
An organocatalytic asymmetric trifluoromethylthiolation of 3‐aryl or 3‐alkyloxindoles employing a trifluoromethyl‐substituted thioperoxide as the electrophilic trifluoromethylthiolating reagent was described. Reactions occurred in good to excellent enantioselectivities to generate oxindoles with a SCF3‐substituted quaternary chiral center.
Catalytic enantioselective trifluoromethylthiolation of oxindoles using shelf-stable N-(trifluoromethylthio)phthalimide and a cinchona alkaloid catalyst
The organocatalytic enantioselectivetrifluoromethylthiolation of oxindoles employing N-(trifluoromethylthio)phthalimide as a stable, easy to handle CF3S-source has been developed. Optically active products with a quaternary stereogenic center bearing a CF3S-group are obtained in good yields and with good to excellent enantioselectivities.