<i>meta</i> C–H Arylation of Electron-Rich Arenes: Reversing the Conventional Site Selectivity
作者:Luo-Yan Liu、Jennifer X. Qiao、Kap-Sun Yeung、William R. Ewing、Jin-Quan Yu
DOI:10.1021/jacs.9b07887
日期:2019.9.18
report the first catalytic system that effectively performs meta C-Harylation of a variety of alkoxy aromatics including 2,3-dihydrobenzofuran and chromane with exclusive meta site-selectivity, thus reversing the conventional site selectivity governed by native electroniceffects. The identification of an effective ligand and modified norbornene (NBE-CO2Me), as well as taking advantage of the statistics
S,O‐Ligand Promoted
<i>meta</i>
‐C−H Arylation of Anisole Derivatives via Palladium/Norbornene Catalysis
作者:Verena Sukowski、Manuela van Borselen、Simon Mathew、M. Ángeles Fernández‐Ibáñez
DOI:10.1002/anie.202201750
日期:2022.8
A highly efficient meta-selective C−H arylation of aryl ethers has been realized by a new catalytic system based on palladium/norbornene (Pd/NBE) and an S,O-ligand. The reaction proceeds with a broad range of aryl ethers. For the first time, unsymmetrical meta-diarylation of aryl ethers was accomplished using a novel norbornene. The isolation of palladium intermediates provides insight to the mechanism