Cobalt(II)-based Metalloradical Activation of 2-(Diazomethyl)pyridines for Radical Transannulation and Cyclopropanation
作者:Satyajit Roy、Sandip Kumar Das、Buddhadeb Chattopadhyay
DOI:10.1002/anie.201711209
日期:2018.2.19
A new catalytic method for the denitrogenative transannulation/cyclopropanation of in‐situ‐generated 2‐(diazomethyl)pyridines is described using a cobalt‐catalyzed radical‐activation mechanism. The method takes advantage of the inherent properties of a CoIII‐carbene radical intermediate and is the first report of denitrogenative transannulation/cyclopropanation by a radical‐activation mechanism, which
介绍了一种利用钴催化的自由基活化机理对原位生成的2-(重氮甲基)吡啶进行脱氮环转移/环丙烷化的新催化方法。该方法利用了Co III-卡宾自由基中间体的固有性质,并且是通过自由基激活机制进行脱氮脱环/环丙烷化的第一篇报道,并得到了各种控制实验的支持。(±)-单morine的总合成时间短,证明了金属-金属法的综合优势。