4-Arylcoumarins can be prepared in good to high yields by reacting readily available methyl or butyl 3-(o-hydroxyaryl)acrylates with aryl iodides and bromides in an n-Bu4NOAc/n-Bu4NBr mixture at 100 °C in the presence of Pd(OAc)2.
Palladium-catalyzed direct arylation of 4-hydroxycoumarins with arylboronic acids via C–OH bond activation
作者:Yong Luo、Jie Wu
DOI:10.1016/j.tetlet.2009.02.116
日期:2009.5
Operationally simple PdCl2-Catalyzed direct arylation of 4-hydroxycoumarins with arylboronic acids via C-OH bond activation under mild conditions is described, which gave rise to the corresponding 4-arylcoumarins in good to excellent yields. (c) 2009 Elsevier Ltd. All rights reserved.
An efficient route to 4-substituted coumarins, 2(5H)-furanones, and pyrones via palladium-catalyzed couplings of alkenyl tosylates with organoindium reagents
Highly efficient palladium-catalyzed couplings of alkenyl tosylates with organoindium reagents under mild conditions are described, which give rise to 4-substituted coumarins, 2(5H)-furanones, and pyrones in good to excellent yields. (C) 2009 Elsevier Ltd. All rights reserved.