Catalytic Enantioselective Synthesis of 3,4-Unsubstituted Thiochromenes through Sulfa-Michael/Julia–Kocienski Olefination Cascade Reaction
作者:Amit Kumar Simlandy、Santanu Mukherjee
DOI:10.1021/acs.joc.7b00579
日期:2017.5.5
A highly enantioselective cascade sulfa-Michael/Julia–Kocienski olefination reaction between 2-mercaptobenzaldehydes and β-substituted vinyl PT-sulfones has been realized for the synthesis of 3,4-unsubstituted 2H-thiochromenes. This reaction, catalyzed by diphenylprolinol TMS ether, proceeds through an aromatic iminium intermediate and furnishes a wide range of 2-substiuted 2H-thiochromenes with excellent
已经实现了2-巯基苯甲醛和β-取代的乙烯基PT-砜之间高度对映选择性的磺胺-Michael / Julia-Kocienski烯化反应,用于合成3,4-未取代的2 H-硫代色酮。该反应由二苯基脯氨醇TMS醚催化,通过芳族亚胺中间体进行反应,并提供各种具有优良对映选择性(高达99:1 er)的2-取代2 H-硫代色酮。