Catalytic Enantioselective Protonation of Lithium Ester Enolates Generated by Conjugate Addition of Arylthiolate to Enoates
作者:Katsumi Nishimura、Masashi Ono、Yasuo Nagaoka、Kiyoshi Tomioka
DOI:10.1002/1521-3773(20010119)40:2<440::aid-anie440>3.0.co;2-a
日期:2001.1.19
A chiral ligand, a catalytic amount of lithium cation, and no chiral proton source: These are features of the present asymmetric addition-protonation of propenoates with 2-trimethylsilylbenzenethiol. The reaction is catalyzed by a combination of lithium 2-trimethylsilylbenzenethiolate and the chiral ligand 1. Desulfurization of the product affords 2-substituted propanoates with high ee values and without
手性配体,催化量的锂阳离子和无手性质子源:这些是本酸酯与2-三甲基甲硅烷基苯硫醇的不对称加成质子化的特征。该反应由2-三甲基甲硅烷基苯硫醇锂和手性配体1的组合催化。产物的脱硫得到具有高ee值且没有外消旋作用的2-取代的丙酸酯。此外,可以定量地回收1以便重新使用。