Cu2O-Catalyzed Ullmann-type C N cross-coupling reaction of carbazole and aryl chlorides
作者:Baiyao Zhu、Wenfang Xiong、Xiaobin Tan、Wanqing Wu、Huanfeng Jiang
DOI:10.1016/j.tetlet.2022.154140
日期:2022.10
A copper-catalyzed Ullmann-type CN cross-coupling reaction of carbazole with aryl chlorides has been developed employing N,N′-bis(thiophene-2-ylmethyl)oxalamide as ligand. The reaction proceeds at 140 °C with Cs2CO3 as the base in DMSO/MeCN to afford N-arylcarbazole in good to excellent yields. Both the heteroaromatic ring and amide structures in ligands are important for their efficiency.
以N , N'-双(噻吩-2-基甲基)草酰胺为配体,开发了咔唑与芳基氯化物的铜催化乌尔曼型CN交叉偶联反应。该反应在 140 °C 下以 Cs 2 CO 3作为碱在 DMSO/MeCN 中进行,以良好至优异的收率得到N-芳基咔唑。配体中的杂芳环和酰胺结构对其效率都很重要。