Ligands for Metals and Improved Metal-Catalyzed Processes Based Thereon
申请人:Buchwald L. Stephen
公开号:US20080033171A1
公开(公告)日:2008-02-07
One aspect of the present invention relates to novel ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.
Highly Active Palladium Catalysts for Suzuki Coupling Reactions
作者:John P. Wolfe、Robert A. Singer、Bryant H. Yang、Stephen L. Buchwald
DOI:10.1021/ja992130h
日期:1999.10.1
room-temperature Suzukicoupling of aryl bromides and aryl chlorides with 0.5−1.0 mol % Pd. Use of o-(dicyclohexylphosphino)biphenyl (2) allows Suzukicouplings to be carried out at low catalyst loadings (0.000001−0.02 mol % Pd). The process tolerates a broad range of functional groups and substrate combinations including the use of sterically hindered substrates. This is the most activecatalyst system in