Bifunctional Iminophosphorane Catalyzed Amide Enolization for Enantioselective Cyclohexadienone Desymmetrization
作者:Charmaine Y. X. Poh、Daniel Rozsar、Jinchao Yang、Kirsten E. Christensen、Darren J. Dixon
DOI:10.1002/anie.202315401
日期:2024.1.25
The enolization of 2-arylacetamides, followed by an enantioselective intramolecular conjugate addition to tethered 2,5-cyclohexadienones, yielding saturated fused N-heterocycles, is described. The transformation is achieved by employing a bifunctional iminophosphorane (BIMP) superbase catalyst and represents the first unactivated carboxamide deprotonation in a metal-free, catalytic, and enantioselective
描述了 2-芳基乙酰胺的烯醇化,然后与束缚的 2,5-环己二酮进行对映选择性分子内缀合物加成,产生饱和稠合 N-杂环。该转化是通过使用双功能亚氨基正膦 (BIMP) 超强碱催化剂实现的,代表了无金属、催化和对映选择性转化中首次未活化的甲酰胺去质子化。