Air Stable, Sterically Hindered Ferrocenyl Dialkylphosphines for Palladium-Catalyzed C−C, C−N, and C−O Bond-Forming Cross-Couplings
作者:Noriyasu Kataoka、Quinetta Shelby、James P. Stambuli、John F. Hartwig
DOI:10.1021/jo025732j
日期:2002.8.1
aryl halides coupled with acyclic or cyclic secondary alkyl- and arylamines, with primary alkyl- and arylamines, and with aryl- and primary alkylboronicacids. These last couplings provide the first general procedure for reaction of terminal alkylboronicacids with aryl halides without toxic or expensive bases. The ligand not only generates highly active palladium catalysts, but it is air stable in
Catalyst for aromatic C—O, C—N, and C—C bond formation
申请人:Yale University
公开号:US06562989B2
公开(公告)日:2003-05-13
The present invention is directed to a transition metal catalyst, comprising a Group 8 metal and a ligand having the structure
wherein R, R′ and R″ are organic groups having 1-15 carbon atoms, n=1-5, and m=0-4. The present invention is also directed to a method of forming a compound having an aromatic or vinylic carbon-oxygen, carbon-nitrogen, or carbon-carbon bond using the above catalyst. The catalyst and the method of using the catalyst are advantageous in preparation of compounds under mild conditions of approximately room temperature and pressure.
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
作者:Christian Burstein、Christian W. Lehmann、Frank Glorius
DOI:10.1016/j.tet.2005.03.115
日期:2005.6
These salts are precursors for a new class of N-heterocycliccarbeneligands. As a consequence of their bicyclic geometry, these ligands are capable of influencing the coordination sphere of a carbene bound metal. The usefulness of these ligands was demonstrated in the palladium-catalyzed Suzuki–Miyaura cross-coupling of stericallyhinderedarylchlorides.
据报道,已经合成了不同取代的2 H-咪唑并[1,5 - a ]吡啶-4-溴化铵。这些盐是新型N-杂环卡宾配体的前体。由于其双环几何结构,这些配体能够影响卡宾键合金属的配位球。在钯催化的空间受阻芳基氯的Suzuki-Miyaura交叉偶联中证明了这些配体的有用性。
NHC-Pd(II)-azole complexes catalyzed Suzuki–Miyaura cross-coupling of sterically hindered aryl chlorides with arylboronic acids
hindered biaryls efficiently, a series of NHC-Pd(II)-azole complexes bearing sterically hindered ligands were synthesized and characterized. The steric environment effect as well as the electronic effect of the azole ligands has been assessed. All these complexes were applied in the Suzuki−Miyaura cross-coupling reaction of sterically hindered arylchlorides with low catalysts loadings (0.1 mol %) under