Efficient Anodic and Direct Phenol-Arene C,C Cross-Coupling: The Benign Role of Water or Methanol
作者:Axel Kirste、Bernd Elsler、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1021/ja211005g
日期:2012.2.22
reactions for the synthesis of nonsymmetrical biaryls represent one of the most significant transformations in contemporary organic chemistry. A variety of useful synthetic methods have been developed in recent decades, since nonsymmetrical biaryls play an evident role in natural product synthesis, as ligand systems in homogeneous catalysis and materials science. Transformation of simple arenes by direct
Anodic Phenol-Arene Cross-Coupling Reaction on Boron-Doped Diamond Electrodes
作者:Axel Kirste、Gregor Schnakenburg、Florian Stecker、Andreas Fischer、Siegfried R. Waldvogel
DOI:10.1002/anie.200904763
日期:2010.1.25
Particularly sustainable: The anodiccross‐couplingreaction between phenols and arenes can be performed on boron‐doped diamond electrodes. The arylated products are formed directly and obtained, in some cases, with high selectivity. Since only hydrogen atoms are sacrificed in the course of reaction this methodology opens the door to a novel concept for biaryl formation.
Oxidative Cross-Coupling of Substituted Phenols with Unactivated Aromatics
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1002/ejoc.201700666
日期:2017.8.10
C–H arylation of substituted phenols or naphthols with substituted aromatics in the presence of K2S2O8 and Bu4N+·HSO4– in CF3COOH at ambient temperature providing unsymmetrical biaryls is described. The cross-coupling reaction is compatible with various substituted phenols and aromatics. Based on oxidation potential studies, it was observed that phenols with oxidation potentials up to 0.68 V and naphthols
描述了在环境温度下在 CF3COOH 中,在 K2S2O8 和 Bu4N+·HSO4– 存在下,取代苯酚或萘酚与取代芳烃的区域选择性 C-H 芳基化反应,提供不对称的联芳基化合物。交叉偶联反应与各种取代苯酚和芳烃相容。根据氧化电位研究,观察到氧化电位高达 0.68 V 的酚和高达 0.88 V 的萘酚与反应相容。交叉偶联反应通过 K2S2O8 与取代苯酚的反应进行,提供阳离子苯酚自由基中间体,该中间体通过 H+ 的解离进一步转化为苯氧基自由基中间体。随后苯氧基自由基中间体与取代芳烃的自由基-阴离子偶联提供交叉偶联产物。