Solvent-controlled selective synthesis of biphenols and quinones via oxidative coupling of phenols
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1039/c7cc04829g
日期:——
A regioselective synthesis of unsymmetrical and symmetrical biphenols and binaphthols via oxidativecoupling of phenols or naphthols in the presence of K2S2O8 in CF3COOH at ambient conditions is described. Interestingly, 1:1 ratio of H2O and CH3CN solvent mixtures at 80 °C instead of CF3COOH provided substituted unsymmetrical quinones. A gram scale synthesis of biphenols and binaphthols was demonstrated
描述了在环境条件下在CF 3 COOH中在K 2 S 2 O 8存在下通过酚或萘酚的氧化偶联的不对称和对称的双酚和联萘酚的区域选择性合成。有趣的是,在80°C的H2O和CH3CN溶剂混合物以1:1的比例代替CF3COOH提供了取代的不对称醌。证明了双酚和联萘酚的克级合成。
Highly Selective Electrosynthesis of Biphenols on Graphite Electrodes in Fluorinated Media
作者:Axel Kirste、Shotaro Hayashi、Gregor Schnakenburg、Itamar M. Malkowsky、Florian Stecker、Andreas Fischer、Toshio Fuchigami、Siegfried R. Waldvogel
DOI:10.1002/chem.201102182
日期:2011.12.9
The direct and selective phenol coupling reaction that provides biphenols still represents a challenge in organic synthesis. The recently developed electrosynthesis on boron‐doped diamond anodes with fluorinated additives was developed further to allow the application to less‐expensive electrodes and fluorinatedmedia. This advanced protocol allows the highlyselective anodic phenol coupling reaction
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 Two Different Phenols: An Efficient Route to Unsymmetrical Biphenols
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.5b01324
日期:2015.6.19
An efficient synthesis of unsymmetrical biphenols via the oxidative cross-coupling of two different phenols in the presence of K2S2O8 and Bu4N+.HSO3- (10 mol %) in CF3COOH at ambient conditions is described. 1:1 Cross-coupling of substituted phenols with naphthols and 1:2 cross-coupling of naphthols with phenol are also disclosed. By using Bu4N+.HSO3-, the homocoupling of phenols or naphthols was controlled. In these reactions, the ortho C-H bond of two different phenols and the ortho and para C-H bond of phenols were coupled together.
Selective, Catalytic, and Metal-Free Coupling of Electron-Rich Phenols and Anilides Using Molecular Oxygen as Terminal Oxidant
作者:Luis Bering、Melina Vogt、Felix M. Paulussen、Andrey P. Antonchick
DOI:10.1021/acs.orglett.8b01631
日期:2018.7.6
Selective oxidative homo- and cross-coupling of electron-rich phenols and anilides was developed using nitrosonium tetrafluoroborate as a catalyst. Oxidative coupling of phenols revealed unusual selectivities, which translated into the unprecedented synthesis of inverse Pummerer-type ketones. Mechanistic studies suggest that oxidative coupling of phenols and anilides shares a common pathway via homolytical