Selective Oxidative [4+2] Imine/Alkene Annulation with H<sub>2</sub>
Liberation Induced by Photo-Oxidation
作者:Xia Hu、Guoting Zhang、Faxiang Bu、Aiwen Lei
DOI:10.1002/anie.201711359
日期:2018.1.26
The oxidative [4+2] annulation reaction represents an elegant and versatile synthetic protocol for the construction of six‐membered heterocyclic compounds. Herein, a photoinduced oxidative [4+2] annulation of NH imines and alkenes was developed by utilizing a dual photoredox/cobaloxime catalytic system. Various multisubstituted 3,4‐dihydroisoquinolines can be obtained in good yields. This method is
氧化[4 + 2]环化反应是构建六元杂环化合物的一种优雅而通用的合成方案。在本文中,利用双光氧化还原/钴氧肟催化系统开发了NH亚胺和烯烃的光诱导氧化[4 + 2]环。可以高收率获得各种多取代的3,4-二氢异喹啉。该方法不仅消除了化学计量的氧化剂的需要,而且通过产生H 2作为唯一的副产物而表现出优异的原子经济性。显着地, 即使使用烯烃的Z / E混合物,在该转化中也可以实现高的区域选择性和反式非对映选择性。