Copper(II)-Catalyzed meta-Selective Direct Arylation of α-Aryl Carbonyl Compounds
作者:Hung A. Duong、Ruth E. Gilligan、Michael L. Cooke、Robert J. Phipps、Matthew J. Gaunt
DOI:10.1002/anie.201004704
日期:2011.1.10
Strong competition: A method for the meta‐selectivearylation of the highly versatile α‐aryl carbonyl motif using diaryliodonium salts is described. In this CuII‐catalyzed process the remote carbonyl group is capable of overpowering even strongly para‐directing functionalities to form the elusive meta‐products (see scheme). Remarkably, the arylation process can also operate under metal‐free conditions
Utilization of a Copper on Iron Catalyst for the Synthesis of Biaryl Systems and Benzoxazines via Oxidative Arylation of Anilide Derivatives
作者:Zoltán Novák、Anna Székely、Ádám Sinai、Edina Tóth
DOI:10.1055/s-0033-1338642
日期:——
Heterogeneous copper on iron catalyst serves as an efficient alternative copper source for arylation reactions using hypervalent iodonium salts. The copper(0) catalyst affords meta-arylation of pivalanilides, while 2-ethynylanilides undergo oxidative carboarylation–ring closure with diaryliodonium salts. Heterogeneous copper on iron catalyst serves as an efficient alternative copper source for arylation reactions
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
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
Mechanistic Understanding of the Unexpected Meta Selectivity in Copper-Catalyzed Anilide C–H Bond Arylation
作者:Bo Chen、Xue-Long Hou、Yu-Xue Li、Yun-Dong Wu
DOI:10.1021/ja201425e
日期:2011.5.25
DFT calculations suggest that the unexpected meta product in the copper-catalyzed arylation of anilide is formed via a Heck-like four-membered-ring transition state involving a Cu(III)-Ph species. A competitive electrophilic substitution mechanism delivers the ortho product when a methoxy group is present at the meta position of pivanilide. A series of experiments including kinetic studies support