Highly regioselective Heck reactions of heteroaryl halides with electron-rich olefins in ionic liquid
作者:Wen Pei、Jun Mo、Jianliang Xiao
DOI:10.1016/j.jorganchem.2005.03.008
日期:2005.8
Palladium-catalyzed Heck reactions of the heteroaryl halides, halopyridines, bromoquinoline and bromothiophenes, with the electron-richolefins vinyl ethers and allyl alcohol were shown to give essentially only the branched olefins in an imidazolium ionic liquid, whereas in molecular solvents a mixture of regioisomers was formed. The method obviates the need for aryl triflates and stoichiometric inorganic
cis,cis,cis-1,2,3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)]2 system catalyses efficiently the Heck reaction of heteroaryl halides with n-butyl acrylate, styrene, vinylpyridine and vinyl ether derivatives. High turnover numbers can be obtained for the reactions with halo pyridines, quinolines, furans or thiophenes.
Aqueous DMF−Potassium Carbonate as a Substitute for Thallium and Silver Additives in the Palladium-Catalyzed Conversion of Aryl Bromides to Acetyl Arenes
作者:Karl S. A. Vallin、Mats Larhed、Anders Hallberg
DOI:10.1021/jo015599f
日期:2001.6.1
Highly selective palladium-catalyzed internal alpha -arylations of alkyl vinyl ethers with aryl and heteroaryl bromides were conveniently conducted in aqueous DMF with potassium carbonate as base and with DPPP as bidentate ligand. The corresponding acetyl arene products were, after hydrolysis, isolated in good to excellent yields. This Heck reaction procedure does not require toxic thallium or expensive silver salt additives, is promoted by water, and is suggested to proceed via charged organopalladium intermediates. Single-mode microwave irradiation was utilized in one example to shorten the reaction time.
Wright; Hageman; McClure, Journal of Heterocyclic Chemistry, 1998, vol. 35, # 3, p. 717 - 723
作者:Wright、Hageman、McClure
DOI:——
日期:——
A Robust First-Pass Protocol for the Heck–Mizoroki Reaction
作者:Paul M. Murray、John F. Bower、David K. Cox、Ewan K. Galbraith、Jeremy S. Parker、Joseph B. Sweeney
DOI:10.1021/op300364p
日期:2013.3.15
The Heck-Mizoroki (HM) reaction is one of the most widely used C-C bond-forming methods of contemporary synthesis. Notwithstanding this, these reactions frequently require significant optimization before efficient transformations can be obtained. We describe here the results of a study that aimed to establish a generic experimental protocol for HM reactions which enables acceptable yields from first-pass experiments. The methodology utilizes readily available stable catalysts and can be applied to a broad range of coupling partners.