Chiral Brønsted Acid Catalyzed Enantioconvergent Propargylic Substitution Reaction of Racemic Secondary Propargylic Alcohols with Thiols
作者:Jun Kikuchi、Kyohei Takano、Yusuke Ota、Shigenobu Umemiya、Masahiro Terada
DOI:10.1002/chem.202001609
日期:2020.9
catalysts, the enantioselective nucleophilic substitution reaction at the chiral sp3‐hybridized carbon atom of a racemic electrophile has not been largely explored. Herein, we report the enantioconvergent propargylic substitution reaction of racemic propargylic alcohols with thiols using chiral bis‐phosphoric acid as the chiral Brønsted acid catalyst. The substitution products were formed in high yields
尽管使用手性催化剂的对映选择性反应取得了重大进展,但手性sp 3上的对映选择性亲核取代反应外消旋亲电体的杂化碳原子尚未得到广泛研究。本文中,我们报道了使用手性双磷酸作为手性布朗斯台德酸催化剂,外消旋炔丙醇与巯基的对映体会聚炔丙基取代反应。在大多数情况下,以高收率和高对映选择性形成取代产物。在炔基末端引入的硫官能团的阳离子稳定作用是实现有效对映体聚合过程的关键,在该过程中,不仅从外消旋立体异构中心而且从形成的接触离子对中衍生出手性信息系统。