Access to Optically Enriched α-Aryloxycarboxylic Esters via Carbene-Catalyzed Dynamic Kinetic Resolution and Transesterification
作者:Bin Liu、Runjiang Song、Jun Xu、Pankaj Kumar Majhi、Xing Yang、Song Yang、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/acs.orglett.0c00748
日期:2020.5.1
Disclosed here is a carbene-catalyzed dynamic kinetic resolution and transesterification reaction for access to this class of molecules with up to 99% yields and 99:1 er values. Addition of a chiral carbene catalyst to the ester substrate leads to two diastereomeric azolium ester intermediates that can quickly epimerize to each other and thus allows for effective dynamic kinetic resolution to be realized
光学活性α-芳氧基羧酸及其衍生物是重要的功能分子。这里公开了一种卡宾催化的动态动力学拆分和酯交换反应,用于以高达 99% 的产率和 99:1 的 er 值获得这类分子。将手性卡宾催化剂添加到酯底物中会产生两种非对映体唑鎓酯中间体,它们可以快速彼此差向异构化,从而实现有效的动态动力学拆分。我们反应中的光学富集酯产物可以快速转化为手性除草剂和其他生物活性分子。