Iron-Carbonyl-Catalyzed Redox-Neutral [4+2] Annulation of N−H Imines and Internal Alkynes by C−H Bond Activation
作者:Teng Jia、Chongyang Zhao、Ruoyu He、Hui Chen、Congyang Wang
DOI:10.1002/anie.201600365
日期:2016.4.18
mediated by iron carbonyls was reported by Pauson as early as in 1965, yet the catalytic C−H transformations have not been developed. Herein, an iron‐catalyzed annulation of N−H imines and internal alkynes to furnish cis‐3,4‐dihydroisoquinolines is described, and represents the first iron‐carbonyl‐catalyzed C−H activation reaction of arenes. Remarkablely, this is also the first redox‐neutral [4+2] annulation
早在1965年,鲍森(Pauson)就报道了羰基铁介导的芳烃的化学计量C-H键活化,但催化C-H转化尚未开发。本文描述了一种铁催化的N-H亚胺和内部炔烃的环化反应,提供顺式-3,4-二氢异喹啉,它代表了芳烃的第一个铁-羰基催化的CH-H活化反应。值得注意的是,这也是通过CH活化进行的亚胺和炔烃的首次氧化还原中性[4 + 2]环化反应。该反应也仅具有顺式作用 既不需要碱,也不需要外部配体,也不需要添加剂,即可获得立体选择性和出色的原子经济性。实验和理论研究揭示了CH键活化的氧化加成机理,从而提供了双核铁环和协同的二价铁促进H向炔烃的转移,这是决定营业额的步骤。