Room-temperature activation of aryl chlorides in Suzuki–Miyaura coupling using a [Pd(μ-Cl)Cl(NHC)]2 complex (NHC = N-heterocyclic carbene)
作者:Olivier Diebolt、Pierre Braunstein、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1039/b804695f
日期:——
A straightforwardly synthesised complex, [Pd(μ-Cl)Cl(NHC)]2 (NHC = bis(2,6-diisopropylphenyl)imidazol-2-ylidene, IPr), has been employed to mediate SuzukiâMiyaura reactions involving aryl chlorides at very low catalyst loadings and at room temperature.
A new family of phosphine ligands bearing a bulky carbazolyl scaffold is described. With the combination of ligand 2a and Pd(OAc)2, difficult tri-ortho-substituted biaryl couplings are accomplished smoothly. In particular, the catalyst loading as low as 0.02 mol% of Pd for non-activated 2,6-disubstituted aryl chloride coupling can be achieved.
A Novel Triphosphoramidite Ligand for Highly Regioselective Linear Hydroformylation of Terminal and Internal Olefins
作者:Caiyou Chen、Yu Qiao、Huiling Geng、Xumu Zhang
DOI:10.1021/ol400033k
日期:2013.3.1
The first triphosphorus ligand has been designed and synthesized for highly regioselective linear hydroformylations. A very high l/b ratio (up to 471, 99.8% linear selectivity) was obtained in the linear hydroformylation of representative terminal and internalolefins. For the range of substrates tested, the regioselectivities achieved utilizing the novel triphosphoramidite ligand were much better
A Planar-Chiral Phosphino(alkenyl)ferrocene for Suzuki-Miyaura C-C Coupling Reactions
作者:Dieter Schaarschmidt、Martin Grumbt、Alexander Hildebrandt、Heinrich Lang
DOI:10.1002/ejoc.201402861
日期:2014.10
applied in the presence of palladium in Suzuki–Miyauracouplings for the synthesis of sterically congested biaryls. The catalytic activity arises from homogeneous palladium phosphine complexes, of which the potential pre-catalyst [Pd(4)2Cl2] was characterized structurally. The catalytic system is excellently suited for the synthesis of tri-ortho-substituted biaryls under mild conditions (0.1 mol-%, 50–100
Synthesis of Biaryls via Decarboxylative Pd-Catalyzed Cross-Coupling Reaction
作者:Jean-Michel Becht、Cédric Catala、Claude Le Drian、Alain Wagner
DOI:10.1021/ol070495y
日期:2007.4.1
and efficient route to biaryls via Pd-catalyzed decarboxylative cross-couplings of arene carboxylic acids and aryl iodides is reported. The PdCl2/AsPh3 catalytic system in the presence of Ag2CO3 in DMSO was found to be particularly efficient to perform this transformation. This reaction can be extended to the synthesis of various biaryls, including sterically hindered biaryls, with yields ranging from