oxidative olefination of indole at C‐2, C‐3, C‐4 and C‐7 positions was well addressed. We report here a rhodium‐catalyzed NH‐indole‐directed ortho C−H bond olefination of 2‐arylindoles. This cross‐dehydrogenative‐coupling proved to be broad in substrate scope, tolerating a variety of functional groups. The synthesis of 6H‐isoindolo[2,1‐α]indoles via rhodium‐catalyzed ortho C−H olefination and subsequent
A Three-Component Strategy for Benzoselenophene Synthesis under Metal-Free Conditions Using Selenium Powder
作者:Penghui Ni、Jing Tan、Wenqi Zhao、Huawen Huang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1021/acs.orglett.9b00739
日期:2019.5.17
An efficient three-component benzoselenophenes formation has been developed from substituted indoles, acetophenones, and selenium powder under metal-free conditions. 2-Aryl indoles played an important role to promote benzoselenophene formation from acetophenone derivatives and selenium powder. One C–C and two C–Se bonds were selectively formed to provide 40 new benzoselenophenes in good yields.
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。
Synthesis of binuclear iridium(III) and rhodium(III) complexes bearing methylnaphthalene-linked N-heterocyclic carbenes, and application to intramolecular hydroamination
with silver oxide followed by [Cp∗MCl2]2 (M = Ir, Rh), binuclear iridium and rhodiumcomplexes 2 were formed. Reaction of these complexes 2 with AgPF6 afforded Cl-bridged cationic binuclear iridium and rhodiumcomplexes 3. X-ray crystallographic analysis of 3 revealed that the two imidazole rings of the carbene ligand are in a parallel geometry. The cationic binuclear iridiumcomplexes 3-Ir could be
Iron-catalysed radical cyclization to synthesize germanium-substituted indolo[2,1-<i>a</i>]isoquinolin-6(5<i>H</i>)-ones and indolin-2-ones
作者:Yani Luo、Tian Tian、Yasushi Nishihara、Leiyang Lv、Zhiping Li
DOI:10.1039/d1cc03907e
日期:——
A simple and efficient iron-catalysed radical cyclization to synthesize germanium-substituted indolo[2,1-a]isoquinolin-6(5H)-ones and indolin-2-ones has been developed.