Robust acenaphthoimidazolylidene palladiumcomplexes have been demonstrated as highlyefficient and general catalysts for the sterically hindered Suzuki–Miyaura cross-coupling reactions in excellent yields even with low catalyst loadings under mild reaction conditions. The high catalytic activity of these complexes highlights that, besides the “flexible steric bulky” concept, σ-donor properties of
Suzuki-Miyaura coupling reactions of aryl chlorides catalyzed by a new nickel(II) σ-aryl complex
作者:Xiangyang Lei、Karla A. Obregon、Jhansi Alla
DOI:10.1002/aoc.3000
日期:2013.7
A new nickel(II) σ‐arylcomplex, trans‐chloro(9‐phenanthrenyl)bis(triphenylphosphine)nickel(II), was used as a precatalyst for the Suzuki–Miyaura coupling reactions of arylchlorides. The catalytic conditions were optimized by investigating the cross‐coupling of p‐chloroanisole with phenylboronic acid. The results show that this complex is efficient for both electron‐rich and electron‐deficient aryl
Stereoselective synthesis of olefins by a reductive coupling reaction
作者:Guoxiong Hua、Yang Li、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b702818k
日期:——
Ketones and aldehydes are converted to symmetrical and (E)-olefins (1-15) by reaction with 2,4-bis(phenyl)-1,3-diselenadiphosphetane-2,4-diselenide (PhPSe(2))(2), Woollins' reagent, in refluxing toluene; use of diketones was demonstrated by the reaction of PhC(O)CH(2)C(O)Ph which gives 1,2,4,5-tetraphenylbenzene (16) in 83% yield.
Nickel-catalyzedcross-coupling of Grignardreagents with aryl (poly)fluorides or (poly)chlorides can be achieved efficiently in the presence of a new triarylphosphine ligand bearing a nearby hydroxy group. The high reactivity and the unique chemoselectivity (ArF > ArOTf > ArSR) of the catalysis have been attributed to synergy of nickel and magnesium atoms preorganized on the ligand, as has been surmised
An Extremely Active and General Catalyst for Suzuki Coupling Reaction of Unreactive Aryl Chlorides
作者:Dong-Hwan Lee、Myung-Jong Jin
DOI:10.1021/ol102677r
日期:2011.1.21
2a acted as a powerful catalyst which allows easy access to the Suzukicouplingreaction of less reactive arylchlorides under mild conditions. A wide range of sterically hindered and deactivated arylchlorides could be efficiently coupled at a low catalyst loading of 0.1 mol %. Furthermore, this catalytic system also proved to be highly effective in one-pot multiple couplings.