efficient kinetic resolution of racemic oxaziridines has been realized via catalytic asymmetric α-hydroxylation of available β-keto esters. In the presence of a chiral bifunctional guanidine catalyst, a variety of optically active oxaziridines and chiral α-hydroxy β-keto esters were generated with excellent results (ee’s of up to 99% and 97% and yields of up to 44% and 54%, respectively).
通过可利用的β-
酮酯的催化不对称α-羟基化,已经实现了外消旋
恶唑烷的有效动力学拆分。在手性双官能
胍催化剂的存在下,生成了多种旋光性
恶唑烷和手性α-羟基β-
酮酸酯,具有优异的结果(ee高达99%和97%,产率高达44%和54% , 分别)。