Enantioselective Synthesis of β-Quaternary Carbon-Containing Chromanes and 3,4-Dihydropyrans via Cu-Catalyzed Intramolecular C–O Bond Formation
作者:Jinhui Cai、Zhen-Kai Wang、Muhammad Usman、Zhi-Wu Lu、Xu-Dong Hu、Wen-Bo Liu
DOI:10.1021/acs.orglett.9b03549
日期:2019.11.1
A copper-catalyzed efficient enantioselective construction of chiral quaternary carbon-containing chromanes and 3,4-dihydropyrans is reported. The desymmetric C-O coupling is enabled by a chiral dimethylcyclohexane-1,2-diamine ligand and provides the desired products in good yields with high enantioselectivities. This method presents a broad substrate scope and is applicable to diversely substituted
报道了铜催化的手性季碳含苯并二氢苯并吡喃和3,4-二氢吡喃的有效对映选择性结构。非对称CO偶联通过手性二甲基环己烷-1,2-二胺配体实现,并以高收率和高对映选择性提供所需产物。该方法提供了广泛的底物范围,并且适用于不同取代的芳基溴化物和烯基溴化物。产品通过克级合成并将产品衍生成有价值的组成部分,从而证明了该应用程序。