Efficient approach to 1,1′-bisindoles <i>via</i> copper(<scp>i</scp>)-catalyzed double domino reaction
作者:Ann-Kathrin Bauer、Jürgen Conrad、Uwe Beifuss
DOI:10.1039/d3ob01231j
日期:——
A highly efficient copper(I)-catalyzed approach for the synthesis of 1,1′-bisindoles that is based on the formation of four bonds in one step has been developed. The unprecedented three component reaction between one molecule of a 1,2-bis(2-bromoaryl)hydrazine and two molecules of a 1,3-diketone employing 10 mol% CuI as a catalyst and Cs2CO3 as a base in DMSO at 100 °C for 24 h delivers substituted
开发了一种高效的铜 ( I ) 催化合成 1,1'-双吲哚的方法,该方法基于一步形成四个键。采用 10 mol% CuI 作为催化剂,Cs 2 CO 3作为碱,在 DMSO 中,一分子 1,2-双(2-溴芳基)肼和两分子 1,3-二酮之间发生前所未有的三组分反应。100°C 24 小时可得到取代的 1,1'-双吲哚,收率高达 92%。新方法采用双多米诺缩合/乌尔曼型 C-C 耦合。它允许从容易获得的起始材料一步有效且实用地获得取代的 1,1'-双吲哚。