Squaramide-Catalyzed Asymmetric Intramolecular Oxa-Michael Reaction of α,β-Unsaturated Carbonyls Containing Benzyl Alcohol: Construction of Chiral 1-Substituted Phthalans
作者:Eun Chae Son、Seung Yeon Kim、Sung-Gon Kim
DOI:10.1021/acs.joc.1c00715
日期:2021.5.7
intramolecular oxa-Michael reactions of benzyl alcohol bearing α,β-unsaturated carbonyls as Michael acceptors are presented herein. Using cinchona squaramide-based organocatalyst, enones as well as α,β-unsaturated esters containing benzyl alcohol provided their corresponding 1,3-dihydroisobenzofuranyl-1-methylene ketones and 1,3-dihydroisobenzofuranyl-1-methylene esters in excellent yields with high
本文介绍了带有α,β-不饱和羰基的苄醇作为迈克尔受体的有机催化对映选择性分子内氧杂-迈克尔反应。使用基于金鸡纳酸方酰胺的有机催化剂,烯酮以及含苄醇的α,β-不饱和酯可提供其相应的1,3-二氢异苯并呋喃基-1-亚甲基酮和1,3-二氢异苯并呋喃基-1-亚甲基酯,且具有高对映选择性。另外,可以从1,3-二氢-2-苯并呋喃-1-醇的Wittig / oxa-Michael反应级联获得对映体富集的1,3-二氢异苯并呋喃基-1-亚甲基酮。