A mild chemoselective method for S-arylation of cysteine has been developed in an open-flask procedure under metal-free conditions using arenediazoniumsalts in methanol.
A gold mediated C−S cross-coupling of aryldiazonium salts with thiols is described. The relevance of the protocol is the use of the readily available and simple gold complex Me2SAuCl. The reaction proceeds under soft conditions and has a broad scope in both the diazonium salt and the thiol.
描述了金介导的芳基重氮盐与硫醇的 C−S 交叉偶联。该协议的相关性是使用容易获得且简单的金络合物 Me 2 SAuCl。该反应在温和的条件下进行,并且在重氮盐和硫醇中都有较宽的范围。
C-S coupling with nitro group as leaving group via simple inorganic salt catalysis
作者:Maojie Xuan、Chunlei Lu、Bo-Lin Lin
DOI:10.1016/j.cclet.2019.07.012
日期:2020.1
An efficient and practical synthetic protocol to synthesize nonsymmetrical aryl thioethers by nucleophilic aromatic substitution (SNAr) reaction of nitroarenes by thiols with potassium phosphate as the catalyst is described. Various moderate to strong electron-withdrawing functional groups are tolerated by the system to provide thioethers in a good to excellent yields. We also showed that the present method allows access to 3 drug examples in a short reaction time. Finally, mechanistic studies suggest that the reaction may form the classic Meisenheimer complex through a two-step addition elimination mechanism. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.