Efficient copper catalysts for C H bond arylation under microwave heating: Direct access to multi-substituted pivanilides
作者:Hyun Ji Yang、Bijoy P. Mathew、Dong Gun Oh、Kyungjae Myung、Ja Hun Kwak、Sung You Hong
DOI:10.1016/j.catcom.2016.11.022
日期:2017.2
We herein describe a parallel comparison between homogeneous and heterogeneous coppercatalysts for microwave-assisted direct CH bond arylation. These catalytic systems feature enhanced catalytic activities, unique bulky ligand/base effects, mild conditions, and operational simplicity with reduced catalyst loadings and shortened reaction times. A wide range of synthetically challenging multi-substituted
A Meta-Selective Copper-Catalyzed C–H Bond Arylation
作者:Robert J. Phipps、Matthew J. Gaunt
DOI:10.1126/science.1169975
日期:2009.3.20
For over a century, chemical transformations of benzenederivatives have been guided by the high selectivity for electrophilic attack at the ortho/para positions in electron-rich substrates and at the meta position in electron-deficient molecules. We have developed a copper-catalyzed arylation reaction that, in contrast, selectively substitutes phenyl electrophiles at the aromatic carbon–hydrogen sites