Dynamic Kinetic Resolution of γ-Substituted Cyclic β-Ketoesters via Asymmetric Hydrogenation: Constructing Chiral Cyclic β-Hydroxyesters with Three Contiguous Stereocenters
作者:Dan Yang、Xiong Wu、Xiao-Jie Zheng、Jian-Hua Xie、Qi-Lin Zhou
DOI:10.1021/acs.orglett.1c01689
日期:2021.7.2
An efficient asymmetric hydrogenation of racemic γ-substituted cyclic β-ketoesters via dynamic kinetic resolution to provide chiral cyclic β-hydroxy esters with three contiguous stereocenters is reported. Using a chiral spiro iridium catalyst (R)-5 (Ir-SpiroSAP), a series of racemic γ-aryl/alkyl substituted cyclic β-ketoesters were hydrogenated to the corresponding chiral cyclic β-hydroxy esters in
据报道,外消旋 γ-取代的环状 β-酮酯通过动态动力学拆分有效不对称氢化,以提供具有三个连续立体中心的手性环状 β-羟基酯。使用手性螺铱催化剂 ( R ) -5 (Ir-SpiroSAP),一系列外消旋 γ-芳基/烷基取代的环状 β-酮酯以高产率 (84-97%) 氢化成相应的手性环状 β-羟基酯) 具有良好到出色的对映选择性 (69–>99% ee)和顺式、顺式选择性(高达 >99:1)。