A new chiral Brønsted acid derived from carboxylic acid and a chiral oxazaborolidinium ion (COBI), as an activator, is introduced. This acid was successfully applied as a catalyst for the highly enantioselective protonation/nucleophilic addition of diazoesters with carboxylic acids.
引入了一种新的手性布朗斯台德酸,其衍生自
羧酸和手性
恶唑硼烷鎓离子(COBI)作为活化剂。该酸已成功地用作重氮酸酯与
羧酸的高度对映选择性质子化/亲核加成的催化剂。