Selective Oxidative Homo- and Cross-Coupling of Phenols with Aerobic Catalysts
摘要:
Simple catalysts that use atom-economical oxygen as the terminal oxidant to accomplish selective ortho-ortho, ortho-para, or para-para homo-couplings of phenols are described. In addition, chromium salen catalysts have been discovered as uniquely effective in the cross-coupling of different phenols with high chemo- and regioselectivity.
Selective cine Substitution of 1-Arylethenyl Acetates with Arylboron Reagents and a Diene/Rhodium Catalyst
作者:Jung-Yi Yu、Ryosuke Shimizu、Ryoichi Kuwano
DOI:10.1002/anie.201002745
日期:2010.8.23
When the crowd says Bo: A carbon–carbon bond is selectively formed at the β position of 1‐arylethenyl acetate when the alkenyl substrate is reacted with arylboronic acids in the presence of a cycloocta‐1,5‐diene/rhodiumcatalyst. The choice of the ligand is crucial for the unusual cinesubstitution.