Kinetic Resolution of Tertiary Allylic Alcohols: Highly Enantioselective Access to Cyclic Ethers Bearing an α-Tetrasubstituted Stereocenter
作者:Chao-Huan Zhang、Qing Gao、Meng Li、Jian-Fei Wang、Chuan-Ming Yu、Bin Mao
DOI:10.1021/acs.orglett.1c01110
日期:2021.5.21
A chiral phosphoric acid-catalyzed kinetic resolution of tertiary allylic alcohols was developed to provide structurally valuable enantioenriched 2,2-disubstituted tetrahydrofurans, tetrahydropyrans, and oxepane. A variety of tertiary allylic alcohols were resolved with selectivity factors of ≤120. A tertiary allylic carbocationic intermediate mediates the enantioselective intramolecular substitution
开发了手性磷酸催化的叔烯丙基醇的动力学拆分,以提供结构上有价值的对映体富集的2,2-二取代的四氢呋喃,四氢吡喃和氧杂环丁烷。分离出的各种叔烯丙醇的选择性系数≤120。叔烯丙基碳阳离子中间体介导对映选择性分子内取代,以实现高区域和对映选择性。催化剂用量低的克级反应以及回收的醇和产物的后续转化证明了该方法的实用性。