Cp*-Free Cobalt-Catalyzed C–H Activation/Annulations by Traceless <i>N</i>,<i>O</i>-Bidentate Directing Group: Access to Isoquinolines
作者:Xiao-Cai Li、Cong Du、He Zhang、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.9b00866
日期:2019.4.19
N,O-Bidentate directing-enabled, traceless heterocycle synthesis is described via Cp*-free cobalt-catalyzed C–H activation/annulation. The weakly coordinating nature of the carboxylic acid was employed for the preparation of isoquinolines. Meanwhile, the N–O bond of the α-imino-oxy acid can serve as an internal oxidant. Terminal as well as internal alkynes can be efficiently applied to the catalytic
通过无Cp *的钴催化的C–H活化/环化反应,可以描述N,O-二齿导向的无痕杂环合成。羧酸的弱配位性质用于制备异喹啉。同时,α-亚氨基氧基酸的N–O键可作为内部氧化剂。末端炔烃和内部炔烃均可有效地应用于催化系统。这种操作简单的方法显示了广泛的底物范围,所获得的产品具有良好至极好的收率。