General Light-Mediated, Highly Diastereoselective Piperidine Epimerization: From Most Accessible to Most Stable Stereoisomer
作者:Zican Shen、Morgan M. Walker、Shuming Chen、Giovanny A. Parada、Duc M. Chu、Sun Dongbang、James M. Mayer、K. N. Houk、Jonathan A. Ellman
DOI:10.1021/jacs.0c11911
日期:2021.1.13
and hydrogen atom transfer (HAT) approach for the light-mediated epimerization of readily accessible piperidines to provide the more stable diastereomer with high selectivity. The generality of the transformation was explored for a large variety of di- to tetrasubstituted piperidines with aryl, alkyl, and carboxylic acid derivatives at multiple different sites. Piperidines without substitution on nitrogen
我们报告了一种组合的光催化和氢原子转移 (HAT) 方法,用于光介导容易获得的哌啶差向异构化,以提供更稳定的高选择性非对映异构体。对于在多个不同位点具有芳基、烷基和羧酸衍生物的多种二取代至四取代哌啶,探索了转化的普遍性。在氮上没有取代的哌啶以及 N-烷基和芳基衍生物是有效的差向异构化底物。观察到的非对映选择性与计算的异构体相对稳定性相关。反应可逆性、发光猝灭、氘标记研究和量子产率测量的证明提供了有关该机制的信息。