Mixed Directing-Group Strategy: Oxidative C−H/C−H Bond Arylation of Unactivated Arenes by Cobalt Catalysis
作者:Cong Du、Peng-Xiang Li、Xinju Zhu、Jian-Feng Suo、Jun-Long Niu、Mao-Ping Song
DOI:10.1002/anie.201607719
日期:2016.10.17
and a concerted metalation–deprotonation process (pyridine‐directed), were involved to activate two different inert aromatic C−H bonds. Moreover, the aryl radicals have been trapped by 2,6‐di‐tert‐butyl‐4‐methylphenol to form benzylated products. This unique strategy should be useful in the design of other arene C−H/C−H cross‐couplings as well.
公开了一种廉价的[Co(acac)3 ]催化未活化芳烃的氧化CH / CH键芳基化的混合导向基团策略。该策略能够有效地使各种苯甲酰胺和芳基吡啶芳基化,以提供新颖的双官能化联芳基,而这是常规合成途径难以实现的。涉及两个不同的途径,以激活两个不同的惰性芳族CH键,从而实现单电子转金属化过程(8-氨基喹啉定向)和协同的金属化-去质子化过程(吡啶定向)。此外,芳基被2,6-二叔丁基-4-甲基苯酚捕获,形成苄基化产物。这种独特的策略在其他芳烃CH / CH交叉偶联的设计中也应是有用的。