Direct Catalytic Asymmetric Intramolecular Conjugate Addition of Thioamide to α,β-Unsaturated Esters
作者:Yuta Suzuki、Ryo Yazaki、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/chem.201102332
日期:2011.10.17
allows efficient access to optically active five‐ and six‐membered ring systems bearing ester and thioamide functionalities in an anti fashion; these ring systems are amenable to differential functional group manipulation. Direct catalytic, asymmetric, intramolecular conjugate addition of thioamide to α,β‐unsaturated esters is described. In situ generated Cu thioamide enolate, by catalytic deprotonation
质子转移可有效地以反方式进入具有酯和硫酰胺官能团的旋光五元和六元环系统;这些环系统适合于不同的官能团操纵。描述了将硫酰胺直接催化,不对称,分子内共轭加成到α,β-不饱和酯中。通过催化去质子化,原位生成的铜硫代酰胺烯醇铜进行共轭加成/质子化,以实现完全转化(参见方案)。