Palladium-Catalyzed Methylation of Aryl C−H Bond by Using Peroxides
作者:Yuhua Zhang、Jianqing Feng、Chao-Jun Li
DOI:10.1021/ja0775063
日期:2008.3.1
A novel Pd(OAc)2-catalyzed methylation reaction by dicumylperoxide via aryl C−H bond activation was discovered. Various 2-phenylpyridine and acetanilides can be used as reactants in these reactions. Peroxide was used as both the methylatingreagent and the hydrogenacceptor.
The Rh(I)-catalyzed direct reorganization of organic frameworks and group exchanges between carboxylic acids and aryl ketones was developed with the assistance of directinggroup. Biaryls, alkenylarenes, and alkylarenes were produced in high efficiency from aryl ketones and the corresponding carboxylic acids by releasing the other molecule of carboxylic acids and carbon monoxide. A wide range of functional
Transition-Metal-Free Decarboxylative Arylation of 2-Picolinic Acids with Arenes under Air Conditions
作者:Xitao Zhang、Xiujuan Feng、Chuancheng Zhou、Xiaoqiang Yu、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.orglett.8b03043
日期:2018.11.16
transition-metal-free, and direct decarboxylative arylation of 2-picolinic acids with simple arenes is described. The oxidativedecarboxylative arylation of 2-picolinic acids with arenes proceeds readily via N-chloro carbene intermediates to afford 2-arylpyridines in satisfactory to good yields under transition-metal-free conditions. This new type of decarboxylative arylation is operationally simple
Rh(III)-Catalyzed C–H Alkylation of Arenes Using Alkylboron Reagents
作者:He Wang、Songjie Yu、Zisong Qi、Xingwei Li
DOI:10.1021/acs.orglett.5b01232
日期:2015.6.5
alkylation of arenes using commercially available alkyltrifluoroborates is disclosed. Oximes, heteroarenes, azomethines, N-nitrosoamines, and amides are viable directing groups to entail this transformation. The alkyl group in the boron reagent can be extended to primary alkyls, benzyl, and cycloalkyls, and the reaction proceeded with controllable mono- and dialkylation selectivity when both ortho C–H
Palladium-Catalyzed Electrochemical C–H Alkylation of Arenes
作者:Qi-Liang Yang、Chuan-Zeng Li、Liang-Wei Zhang、Yu-Yan Li、Xiaofeng Tong、Xin-Yan Wu、Tian-Sheng Mei
DOI:10.1021/acs.organomet.8b00550
日期:2019.3.25
electrochemical C–H functionalization reactions have emerged as attractive tools for organic synthesis. This process offers an alternative to conventional methods that require harsh chemical oxidants. However, this electrolysis requires divided cells to avoid catalyst deactivation by cathodic reduction. Herein, we report the first example of palladium-catalyzed electrochemical C–H alkylation of arenes using