An iron(<scp>iii</scp>)-catalyzed dehydrogenative cross-coupling reaction of indoles with benzylamines to prepare 3-aminoindole derivatives
作者:Wei-Li Chen、Kun Li、Wei-Cong Liao、Wang-Fu Liang、Pei-Wen Qiu、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1039/d1gc02849a
日期:——
excellent yields through an iron(III)-catalyzed dehydrogenative cross-coupling reaction of 2-arylindoles and primary benzylamines under mild reaction conditions. Mechanistic studies show that a cascade reaction involves a tert-butyl nitrite (TBN)-mediated nitrosation of 2-substituted indoles and a 1,5-hydrogen shift to afford indolenine oximes, sequential iron(III)-catalyzed condensation and a 1,5-hydrogen
我们报告了一种绿色级联方法,通过铁 ( III ) 催化的 2-芳基吲哚和伯苄胺在温和反应条件下的脱氢交叉偶联反应,以良好到优异的产率制备各种 3-氨基吲哚衍生物。机理研究表明,级联反应涉及亚硝酸叔丁酯 (TBN) 介导的 2-取代吲哚的亚硝化和 1,5-氢转移以提供吲哚啉肟、序贯铁 ( III))-催化缩合和 1,5- 氢转移在一锅反应的四个步骤中。该反应显示了吲哚和苄胺的广泛底物范围,并且可以耐受广泛的官能团。此外,反应很容易以克规模进行,反应完成后不会产生废物。3-氨基吲哚产物通过简单的萃取、洗涤和重结晶纯化,无需快速柱色谱。含有3-氨基吲哚单元的双亚胺配体易于一步获得,产率为52%。本方法突出了容易获得的起始材料、简单的纯化程序以及廉价、无毒和环境友好的铁 ( III ) 催化剂的使用。
Rhodium(<scp>iii</scp>)-catalyzed indole-directed carbenoid aryl C–H insertion/cyclization: access to 1,2-benzocarbazoles
A rhodium(III)-catalyzed indole-directed arylC–H bond carbenoid insertion cascade of 2-arylindoles with diazo compounds has been developed. This method provides a rapid access to 1,2-benzocarbazoles and isoquinoline-based polycyclic heteroaromatics with a broad range of functional group tolerance. The primary evaluation of the photoluminescence property of the novel extended π-systems indicated that
Palladium- or ruthenium-catalyzed synthesis of 2-phenylindoles
作者:Taeko Izumi、Toshiko Yokota
DOI:10.1002/jhet.5570290509
日期:1992.8
presence of palladium complex as catalyst. In the reaction, the ruthenium hydride complex showed more effective catalytic activities. 2-Phenylindoles were also prepared from the corresponding α-phenyl-2-aminophenethylalcohols and allyl methyl carbonate by ruthenium-catalyzed cyclization.
α-Imino Iridium Carbenes from Imidoyl Sulfoxonium Ylides: Application in the One-Step Synthesis of Indoles
作者:Clarice A. D. Caiuby、Matheus P. de Jesus、Antonio C. B. Burtoloso
DOI:10.1021/acs.joc.0c00833
日期:2020.6.5
Imidoyl sulfoxonium ylides are presented for the first time as potential precursors to generate α-imino metal-carbene intermediates and applied in direct C–H functionalization reactions catalyzed by [Ir(cod)Cl]2 (4 mol %) to provide 2-substituted indoles (up to 70% yield) in just one step. This class of sulfur ylide is successfully obtained from imidoyl chloride and dimethylsulfoxonium methylide (23