Palladium-Catalyzed Aromatic C–H Bond Nitration Using Removable Directing Groups: Regiospecific Synthesis of Substituted <i>o</i>-Nitrophenols from Related Phenols
作者:Wei Zhang、Jian Zhang、Shaobo Ren、Yunkui Liu
DOI:10.1021/jo502145v
日期:2014.12.5
A general and regiospecific transformation of substituted phenols into the related o-nitrophenols has been achieved via a three-step process involving the palladium-catalyzed chelation-assisted ortho-C–H bond nitration as the key step. In the process, 2-pyridinyloxy groups act as removable directing groups for the palladium-catalyzed ortho-nitration of substituted 2-phenoxypridines, and they can be