Cooperative bimetallic catalysis is a fundamental approach in modern synthetic chemistry. We report bimetallic cooperative catalysis for the direct decarbonylative heteroarylation of ubiquitous carboxylic acids via acyl C‐O/C‐H coupling. This novel catalytic system exploits the cooperative action of a copper catalyst and a palladium catalyst in decarbonylation, which enables highly chemoselective synthesis
A Ni‐catalyzed C−F bond functionalization of unactivated arylfluorides with oxazoles as coupling partners was developed. Various arylated oxazoles could be obtained in moderate to good yields in the presence of Ni(cod)2/IMes catalytic system. A rapid synthesis of natural product texaline was also demonstrated using this protocol. This transformation could be potentially utilized in regioselective
Catalytic constructive deoxygenation of lignin-derived phenols: new C–C bond formation processes from imidazole-sulfonates and ether cleavage reactions
作者:Stuart M. Leckie、Gavin J. Harkness、Matthew L. Clarke
DOI:10.1039/c4cc04939j
日期:——
feedstock for less oxygenated fine chemicals, several catalytic C-Cbond forming reactions utilising guaiacol imidazole sulfonate are demonstrated. These include the cross-coupling of a Grignard, a non-toxic cyanide source, a benzoxazole, and nitromethane. A modified Meyers reaction is used to accomplish a second constructive deoxygenation on a benzoxazole functionalised anisole.
Direct ortho-arylation of 2-arylbenzoxazoles via C–H activation
作者:Fan Yang、Yangjie Wu、Zhiwu Zhu、Junli Zhang、Yanan Li
DOI:10.1016/j.tet.2008.04.099
日期:2008.7
A new and highly regioselective arylation of 2-arylbenzoxazoles based on C–H activation has been developed. The results represent the first examples of palladium-catalyzeddirect ortho-arylation of 2-arylbenzoxazoles and also provide a facile route for the synthesis of complicated structures containing arylated benzoxazoles moieties.
Cooperative Catalysis by Palladium–Nickel Binary Nanocluster for Suzuki–Miyaura Reaction of <i>Ortho</i>-Heterocycle-Tethered Sterically Hindered Aryl Bromides
作者:Kapileswar Seth、Priyank Purohit、Asit K. Chakraborti
DOI:10.1021/ol500587m
日期:2014.5.2
The palladium–nickel binary nanocluster is reported as a new catalyst system for Suzuki–Miyaura cross-coupling of ortho-heterocycle-tethered stericallyhindered aryl bromides. The inferior results obtained with the reported Pd/Ni salts/complexes or individual Pd/Ni nanoparticles as catalyst reveal the cooperative catalytic effect of the Pd and Ni nanoparticles in the Pd–Ni nanocluster. The broad substrate