Cycloisomerization of 2-Alkynylanilines to Indoles Catalyzed by Carbon-Supported Gold Nanoparticles and Subsequent Homocoupling to 3,3′-Biindoles
作者:Jesus E. Perea-Buceta、Tom Wirtanen、Otto-Ville Laukkanen、Mikko K. Mäkelä、Martin Nieger、Michele Melchionna、Nina Huittinen、Jose A. Lopez-Sanchez、Juho Helaja
DOI:10.1002/anie.201305579
日期:2013.11.4
Elevated by the support: 2‐Alkynyl aniline cycloisomerization to indole is catalyzed by cationic Au NPs on a carbon support. Electroneutral and rich 2‐aryl indoles are further converted into 3,3′‐biindoles by oxidative homocoupling that is readily catalyzed by the Au NPs on carbon, and exclusively but also somewhat sluggishly by the carbon support.
Facile cyclization of 2-arylethynyl aniline to 4(1H)-cinnolones: a new chemodosimeter for nitrite ions
作者:Raju Dey、Tanmay Chatterjee、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2010.11.098
日期:2011.1
2-Arylethynyl anilines undergo very fast reaction (5 min) with nitrite ions in aqueous acidic media to produce 4(1H)-cinnolones which exhibit yellow color and UV absorbance at 391 nm. This reaction is irreversible and has been successfully tested for the detection of nitrite ions in water at ppm concentration. Thus, 2-phenylethynyl aniline serves as a chemodosimeter. An efficient and general method
Pd(II)‐Catalyzed C−H Silylation of <i>o</i>‐Alkynylanilines Initiated by an Aminopalladation To Access Disilylated 2‐Phenyl‐1<i>H</i>‐indoles
作者:Yan Chen、Ling Zhu、Xuliang Tan、Xiahong Chen、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1002/adsc.202301119
日期:2024.1.30
Herein a Pd(II)-catalyzed C−H silylation of o-alkynylanilines with hexamethyldisilane for the synthesis of disilylated 2-phenyl-1H-indoles is reported. In this reaction, o-alkynylanilines undergo an aminopalladation, C−H activation, and dealkylation sequence to form five-membered C,C-palladacycles, which then couple with hexamethyldisilane to construct one C−N bond and two C−Si bonds. This method provides
A convenient and efficient protocol for the synthesis of 4(1H)-cinnolones, 1,4-dihydrocinnolines, and cinnolines in aqueous medium: application for detection of nitrite ions
作者:Raju Dey、Brindaban C. Ranu
DOI:10.1016/j.tet.2011.09.016
日期:2011.11
3-Aryl/alkyl-4(1H)-cinnolones are obtained in one step from 2-aryl/alkylethynyl aniline by reaction with sodium nitrite and dilute hydrochloric acid via Richter cyclization. The alkyl cinnolones on reduction with Sn/HCl furnish 1,4-dihydro-3-alkylcinnolines, which are converted to 3-alkylcinnolines by treatment with NaNO2/HCl/KI. The whole process is carried out in aqueous medium at ambient temperature within a short reaction period. The reaction of 2-phenylethynyl aniline exhibits yellow color with UV absorbance at 391 nm and has been successfully tested for the detection of nitrite ions in water at parts per million concentration. (C) 2011 Elsevier Ltd. All rights reserved.
Indium-HI-mediated one-pot reaction of 1-(2-arylethynyl)-2-nitroarenes to 2-arylindoles
作者:Ji Sook Kim、Joon Hee Han、Jung June Lee、Young Moo Jun、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tetlet.2008.04.032
日期:2008.6
While 1-(2-arylethynyl)-2-nitroarenes were reduced to 2-(2-arylethynyl)anilines in the presence of indium and InCl3 in THF/H2O (v/v = 5/1) at 50 degrees C, 1-(2-arylethynyl)-2-nitroarenes were reductively cyclized to 2-arylindoles with good yields in the presence of indium and aqueous HI in benzene. (C) 2008 Elsevier Ltd. All rights reserved.