Cross-Coupling of Alkynylsilanols with Aryl Halides Promoted by Potassium Trimethylsilanolate
摘要:
The palladium-catalyzed cross-coupling of aliphatic alkynylsilanols with aryl iodides has been demonstrated with potassium trimethylsilanolate as the coupling promoter and copper(I) iodide as a cocatalyst. The cross-coupling proceeds at room temperature in good to excellent yield with a range of aryl iodides. A comparison of the reactivity of alkynylsilanols, trimethylsilylalkynes, and terminal alkynes under fluoride and fluoride-free conditions was per-formed to elucidate the role of silicon in the Sonogashira reaction.
The Sonogashirareactionusing nickel ferrite nanoparticles as catalyst and under copper-free conditions was investigated in water as a green solvent. Various types of aryl and alkyl halides were successfully coupled with phenyl acetylene under the optimized reaction conditions with very good to excellent yields at a short time. The catalyst is easily recoverable and can be reused for several runs
Versatile palladium-catalyzed arylation of organomanganese chlorides by aryl bromides
作者:Eric Riguet、Mouâd Alami、Gérard Cahiez
DOI:10.1016/s0022-328x(00)00891-3
日期:2001.4
In THF, a palladium-catalyzed cross-coupling reaction of organomanganese reagents with various aryl bromides including unreactive deactivated or hindered aryl bromides was performed successfully in the presence of a new catalytic system 1% PdCl2(dppp)-four equivalents DME. The scope of the reaction is very broad since many functional groups are tolerated, moreover, even hindered O,O ' -di- or trisubstituted diaryls were obtained in E;igh yields. It is interesting to note that hindered aryl bromides are more reactive than the corresponding aryl iodides. Alkyl, alkenyl and alkynylmanganese chlorides also react under similar conditions. (C) 2001 Elsevier Science B.V. All rights reserved.
Rates and regioselectivities of the palladium-catalyzed ethynylation of substituted bromo- and dibromobenzenes
作者:Rina Singh、George Just
DOI:10.1021/jo00279a040
日期:1989.9
A general synthesis of terminal and internal arylalkynes by the palladium-catalyzed reaction of alkynylzinc reagents with aryl halides
作者:Anthony O. King、Eiichi Negishi、Frank J. Villani、Augustine Silveira