Dynamic Kinetic Asymmetric Transformations of β-Stereogenic α-Ketoesters by Direct Aldolization
作者:Michael T. Corbett、Jeffrey S. Johnson
DOI:10.1002/anie.201306873
日期:2014.1.3
Dynamic kinetic asymmetric transformations (DyKAT) of racemic β‐bromo‐α‐keto esters by direct aldolization of nitromethane and acetone provide access to fully substituted α‐glycolic acid derivatives bearing a β‐stereocenter. The aldol adducts are obtained in excellent yield with high relative and absolute stereocontrol under mild reaction conditions. Mechanistic studies determined that the reactions
通过硝基甲烷和丙酮的直接醛醇化,外消旋 β-溴-α-酮酯的动态动力学不对称转化 (DyKAT) 提供了获得带有 β-立体中心的完全取代的 α-乙醇酸衍生物的途径。在温和的反应条件下,醛醇加合物以极好的收率获得,具有较高的相对和绝对立体控制。机理研究表明,该反应是在 DyKAT I 型歧管下通过简单的催化剂介导的 β-溴-α-酮酯外消旋化进行的。