Ligand-Free Pd-Catalyzed Carbonylative Cross-Coupling Reactions under Atmospheric Pressure of Carbon Monoxide: Synthesis of Aryl Ketones and Heteroaromatic Ketones
作者:Hongling Li、Min Yang、Yanxing Qi、Jijun Xue
DOI:10.1002/ejoc.201001685
日期:2011.5
The carbonylative Suzuki cross-coupling reactions of boronic acids with aryl iodides catalyzed by Pd 2 (dba) 3 as a ligand-free catalyst under atmospheric pressure of carbonmonoxide has been firstly developed. Under mild reaction conditions, a broad range of aryl/heteroaryl iodides and aryl/heteroaryl boronic acids were selectively coupled to afford the corresponding diaryl ketones in good to excellent
10 mA in an undivided cell setup by utilizing CH3CN as a solvent and LiClO4 as an electrolyte at room temperature. Notably, the present strategy enabled the formation of sulfenylphenanthrenes and sulfenyl spiro cyclohexa[4.5]trienones in 70%–95% yield. Scale-up synthesis, mechanistic studies, and cyclic voltammetry have also been carried out.