Gold-Catalyzed Intramolecular Alkyne Cycloisomerization Cascade: Direct Synthesis of Aryl-Annulated[<i>a</i>]carbazoles from Aniline-Substituted Diethynylarenes
Aniline-substituteddiethynylarenes, which are readily synthesized through Sonogashira coupling reactions from commercially available 1,2-dihaloarenes, directly produce aryl- and heteroaryl-annulated[a]carbazoles by the gold-catalyzedintramolecularcascade hydroamination/cycloisomerization without producing theoretical by-products. This new atom-economical route is easily applicable to various ar
苯胺取代的二乙炔基很容易通过Sonogashira偶联反应由市售的1,2-二卤代芳烃合成,通过金催化的分子内级联加氢胺化/环异构化反应直接生成芳基和杂芳基环化的[ a ]咔唑,而不会产生理论副产物。 。这种新的原子经济的路线是容易地应用于各种芳基-环[一]咔唑含有烷基,芳基或酯取代基。
Synthesis of new donor–acceptor–donor materials via Au-catalyzed double cascade cyclization
作者:Giovanni Ferrara、Tienan Jin、Kazuaki Oniwa、Jian Zhao、Abdullah M. Asiri、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2011.11.132
日期:2012.2
A new class of symmetric pi-conjugated donor-acceptor-donor (D-A-D) materials, with aryl- or heteroaryl[a]annulated carbazole (AHA[a]C) moieties as the donors and with 2,1,3-benzothiadiazole (BT) as an acceptor, has been synthesized via NaAuCl4-catalyzed double cascade cyclization of arenyl tetraynes in ethanol in good to high yields. Photophysical and electrochemical properties of the new D-A-D materials were investigated. (C) 2011 Elsevier Ltd. All rights reserved.