Palladium-Catalyzed Indolization of <i>N</i>-Aroylbenzotriazoles with Disubstituted Alkynes
作者:Itaru Nakamura、Tetsuya Nemoto、Naozumi Shiraiwa、Masahiro Terada
DOI:10.1021/ol900113f
日期:2009.3.5
The palladium-catalyzed denitrogenative indolization of N-aroylbenzotriazoles 1 and internal alkynes 2 produced the corresponding polysubstituted indoles 3 in good to high yields. For example, the reaction of 5,6-dimethyl-1-[4-(trifluoromethyl)benzoyl]benzotriazole (1j) with 6-dodecyne (2a), 4-octyne (2b), and diphenylacetylene (2f) in the presence of 10 mol % of Pd(PPh3)4 without solvent at 130 °C
N-芳酰基苯并三唑1和内部炔烃2的钯催化的脱氮吲哚化以良好或高收率产生了相应的多取代的吲哚3。例如,5,6-二甲基-1-[[4-(三氟甲基)苯甲酰基]苯并三唑(1j)与6-十二炔(2a),4-辛炔(2b)和二苯乙炔(2f)的反应在130°C下不使用溶剂的10 mol%Pd(PPh 3)4得到相应的吲哚3i,3l和3p分别达到74%,71%和41%的产量。在本反应中,芳酰基苯并三唑在Larock的吲哚合成中作为2-卤代苯胺的合成等价物。