C–H arylation reactions through aniline activation catalysed by a PANI-g-C<sub>3</sub>N<sub>4</sub>-TiO<sub>2</sub> composite under visible light in aqueous medium
作者:Liang Wang、Jun Shen、Sen Yang、Wenjie Liu、Qun Chen、Mingyang He
DOI:10.1039/c8gc00012c
日期:——
composite was prepared and found to be efficient for radical C–H arylationreactions. The arylation process involved coupling of in situ generated aryl diazonium salts from aniline with heteroarenes, enol acetates or benzoquinones under visible light in aqueous medium or pure water. A broad range of substrates survived the reaction conditions to provide the desired products in moderate to good yields
制备了聚苯胺(聚苯胺)-gC 3 N 4 -TiO 2复合材料,发现它对自由基CHH芳基化反应有效。芳基化过程涉及在水性介质或纯水中在可见光下将苯胺的原位生成的芳基重氮盐与杂芳烃,烯醇乙酸酯或苯醌结合。各种各样的底物在反应条件下均能幸存,以中等至良好的产率提供所需的产物。还实现了放大(10 mmol)合成。该半导体光催化剂显示出良好的光催化性能和稳定性。循环研究表明,这种复合材料很容易被回收,连续十次运行后,催化活性略有下降。
Palladium-Catalyzed Direct CH Functionalization of Benzoquinone
作者:Sarah E. Walker、James A. Jordan-Hore、David G. Johnson、Stuart A. Macgregor、Ai-Lan Lee
DOI:10.1002/anie.201408054
日期:2014.12.8
A direct Pd‐catalyzed CHfunctionalization of benzoquinone (BQ) can be controlled to give either mono‐ or disubstituted BQ, including the installation of two different groups in a one‐pot procedure. BQ can now be directly functionalized with aryl, heteroaryl, cycloalkyl, and cycloalkene groups and, moreover, the reaction is conducted in environmentally benign water or acetone as solvents.
可以控制直接 Pd 催化的苯醌 (BQ) 的C H 官能化以得到单取代或双取代的 BQ,包括在一锅法中安装两个不同的基团。BQ 现在可以直接用芳基、杂芳基、环烷基和环烯基官能化,而且,反应在环境友好的水或丙酮作为溶剂中进行。
FeSO4-promoted direct arylation of benzoquinones with ArB(OH)2 or ArBF3K
作者:Kimihiro Komeyama、Tetsuya Kashihara、Ken Takaki
DOI:10.1016/j.tetlet.2012.12.031
日期:2013.2
FeSO4 center dot 7H(2)O was proven to work as effective promoter for the direct arylation of benzoquinones with aryl boronic acids in the presence of K2S2O8. In the arylation, slow addition of iron solution was crucial to efficiently proceed with the reaction. Interestingly, the Fe-mediated arylation could be converted into a catalytic reaction by using hydroquinones, instead of benzoquinones, or addition of ascorbic acid. (C) 2012 Elsevier Ltd. All rights reserved.
An Optical Method for the Study of Reversible Organic Oxidation—Reduction Systems. IV. Arylquinones
作者:D. E. Kvalnes
DOI:10.1021/ja01326a082
日期:1934.11
C–H Arylation of Benzoquinone in Water through Aniline Activation: Synergistic Effect of Graphite-Supported Copper Oxide Nanoparticles
作者:Aurélien Honraedt、François Le Callonnec、Erwan Le Grognec、Vincent Fernandez、François-Xavier Felpin
DOI:10.1021/jo4004426
日期:2013.5.3
A homemade CuONPs/Gr catalyst was found to be efficient for the C-H arylation of benzoquinone. This methodology represents the first example of a Meerwein arylation catalyzed by a heterogeneous catalyst.