Palladium-catalyzed coupling of aryl halides with alkynes
申请人:Iowa State University Research Foundation, Inc.
公开号:US07642391B1
公开(公告)日:2010-01-05
A method is provided to couple an aryl halide to an alkyne comprising reacting a compound of the formula ArX, wherein Ar is a substituted or unsubstituted aryl group and X is I or Br, with a compound of the formula HC≡C—R1 wherein R1 is a substituted or unsubstituted organic group, in the presence of an effective amount of a phosphine-free, oxime-free palladium catalyst; (C1-C4)alkyl N+(−OAc) or an alkali metal carbonate, to yield a compound of the formula Ar—C≡C—R1, wherein the reaction is carried out in the absence of an organic amine or copper(I).
Palladium-catalysedcoupling of terminalalkynes with arylhalides occurs at room temperature in quite good yields in the presence of a quaternary ammonium salt and a base in a acetonitrile-water solution, without any added cuprous iodide.
New synthetic approaches for the synthesis of indoloquinolines and carbocycle-fused quinolines have been developed employing alkynylketone substrates. These synthetic transformations involved the application of N2-extrusion of azido complexes as a key step to generate carbodiimidium ion and nitriliumion in situ, which further cyclized intramolecularly with alkyne via a domino process to provide indoloquinolines
Guest Covalent Capture by a Host: A Biomimetic Strategy for the Selective Functionalization of a Cavity
作者:Nicolas Menard、Olivia Reinaud、Benoit Colasson
DOI:10.1002/chem.201202391
日期:2013.1.7
A biomimetic strategy for the monofunctionalization of a calix[6]arene core is described. It is based on host–guest chemistry (mimicking the Michaelis–Menten adduct in enzymes) and allows the finely tuned pre‐organization of the substrate (an alkyne) with respect to the reactant (three azido groups introduced at the calixarene large rim). It is shown that the thermal Huisgen reaction implemented in
Coupling reactions of aryl bromides with 1-alkynols catalysed by a tetraphosphine/palladium catalyst
作者:Marie Feuerstein、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tetlet.2003.12.128
日期:2004.2
cis. cis, cis-1, 2, 3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)](2) system catalyses efficiently the coupling reactions of aryl halides with a variety of alkynols such as propargy] alcohol, but-1-yn-4-ol, pent-1-yn-5-ol or hex-1-yn-6-ol. The catalyst can be used at lowloading. Higher reaction rates were observed in the presence of but-1-yn-4-ol, pent-1-yn-5-ol or hex-1-yn-6-ol than with propargy] alcohol. The protection of the alcohol functions as an ether or a silyloxy group led generally to similar or better results than the reactions performed with the unprotected alcohols. (C) 2004 Elsevier Ltd. All rights reserved.