Palladium-Catalyzed Indole, Pyrrole, and Furan Arylation by Aryl Chlorides
作者:Enrico T. Nadres、Anna Lazareva、Olafs Daugulis
DOI:10.1021/jo1018969
日期:2011.1.21
The palladium-catalyzed directarylation of indoles, pyrroles, and furans by aryl chlorides has been demonstrated. The method employs a palladium acetate catalyst, 2-(dicyclohexylphosphino)-biphenyl ligand, and an inorganic base. Electron-rich and electron-poor aryl chlorides as well as chloropyridine couplingpartners can be used, and arylated heterocycles are obtained in moderate to good yields.
Biaryl Cross‐Coupling Enabled by Photo‐Induced Electron Transfer
作者:Hirohito Hayashi、Bin Wang、Xiangyang Wu、Shi Jie Teo、Atsushi Kaga、Kohei Watanabe、Ryo Takita、Edwin K. L. Yeow、Shunsuke Chiba
DOI:10.1002/adsc.201901601
日期:2020.5.26
a protocol for aryl cross‐coupling of electron‐deficient aryl halides with electron‐rich (hetero)arenes that is driven solely by violet light. This process takes advantage of formation of photo‐excited state of electron‐deficient aryl halides, that are reduced by electron‐rich (hetero)arenes to form a pair of aryl anion and cationradicals. The resulting aryl anion radicals of aryl halides undergo mesolysis
Zr-MOF-OH are utilized for photocatalytic arylhalide derivatizations. Phenoxy anions in binaphthol derivatives show high reducing capacity, remarkable activity, good selectivity and fair compatibility towards the activation of arylhalidesthrough a single-electron transfer process under white light irradiation and alkaline conditions. The generated aryl radicals could undergo biaryl cross-coupling
capable of catalyzing cross-coupling reactions in a transition-metal-free fashion under visible light. This method allows the direct CH functionalization of pyrroles and -arylacrylamides with (hetero)aryl halides, respectively, leading to the formation of two sets of structurally important scaffolds including pyrrole-containing biaryls and 3,3′-disubstituted oxindoles with high selectivity. We anticipate