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.
the reduction of unactivated aryl chlorides and alkyl chlorides in the presence of hydrogen atom donor at room temperature. The catalytic system can also be applied to the coupling of aryl chlorides with electron-rich arene and heteroarenes to affect the C–C bond-forming reactions. Our mechanistic study results support the assumption that carbon radicals are formed from the organochlorides via a sin
Generation of Aryl Radicals from Aryl Halides: Rongalite-Promoted Transition-Metal-Free Arylation
作者:Fazhi Yu、Runyu Mao、Mingcheng Yu、Xianfeng Gu、Yonghui Wang
DOI:10.1021/acs.joc.9b01113
日期:2019.8.16
is reported. Rongalite as a novel precursor of super electron donors was used to initiate a series of electron-catalyzed reactions under mild conditions. These transition-metal-free radical chain reactions enable the efficient formation of C–C, C–S, and C–P bonds through homolytic aromatic substitution or SRN1 reactions. Moreover, the synthesis of antipsychoticdrug Quetiapine was performed on gram
Ruthenium(II)-Catalyzed C–H Alkynylation of Heterocycles under Chelation Assistance
作者:Congjun Liu、Yanping Liu、Feng Chang、Qiaojuan Jiang、Zhiwei Ma
DOI:10.1055/s-0036-1591519
日期:2018.3
efficient ruthenium(II)-catalyzed, chelation-assisted C–H alkynylation of heterocycles is described using hypervalent iodine–alkyne as an alkynylating reagent. This reaction proceeds smoothly under mild conditions with high regioselectivity and good functional group tolerance, delivering the desired alkynylated indoles, thiophene, furan, and pyrrole in high yields.
使用高价碘-炔烃作为炔基化试剂描述了一种高效的钌 (II) 催化、螯合辅助的 C-H 杂环炔基化反应。该反应在温和条件下顺利进行,具有高区域选择性和良好的官能团耐受性,以高产率提供所需的炔基化吲哚、噻吩、呋喃和吡咯。
Palladium-phosphine complex catalyzed cross-coupling reaction of 1-methyl-2-pyrrolyl-magnesium bromide and -zinc chloride with organic halides
1-Methyl-2-pyrrolyl-magnesium bromide and -zinc chloride, which were prepared from 1-methyl-2-pyrrolyllithium with MgBr2 and ZnCl2 respectively, reacted with aryl- and heteroaromatic halides to give the corresponding 2-substituted pyrroles in good to excellent yields in the presence of palladium-phosphine complexes as catalysts.