Asymmetric Transfer Hydrogenation of 2,3-Disubstituted Flavanones through Dynamic Kinetic Resolution Enabled by Retro-Oxa-Michael Addition: Construction of Three Contiguous Stereogenic Centers
作者:Qing-Xian Xie、Li-Xia Liu、Zhou-Hao Zhu、Chang-Bin Yu、Yong-Gui Zhou
DOI:10.1021/acs.joc.2c00418
日期:2022.6.3
A ruthenium-catalyzed asymmetric transfer hydrogenation of 2,3-disubstituted flavanones was developed for the construction of three contiguous stereocenters under basic conditions through a combination of dynamic kinetic resolution and retro-oxa-Michael addition, giving chiral flavanols with excellent enantioselectivities and diastereoselectivities. The reaction proceeded via a base-catalyzed retro-oxa-Michael
通过动态动力学拆分和逆氧-迈克尔加成的结合,开发了一种钌催化的 2,3-二取代黄烷酮的不对称转移氢化,用于在碱性条件下构建三个连续的立体中心,从而使手性黄烷醇具有优异的对映选择性和非对映选择性。该反应通过碱催化的逆氧-迈克尔加成同时消旋两个立体中心与高度对映选择性的酮转移氢化步骤进行。在不损失活性和对映选择性的情况下,可以在克级实现不对称转移氢化。