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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(17):4897-4901
Although chiral quaternary ammonium and phosphonium salts are commonly used for asymmetric organocatalysis, the catalytic ability of chiral tertiary sulfonium salts has yet to be demonstrated in asymmetric synthesis. Herein, we show that chiral bifunctional trialkylsulfonium salts catalyze highly enantioselective conjugate additions of 3‐substituted oxindoles to maleimides under base‐free neutral phase‐transfer conditions. 相似文献
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