Synthesis of Carbazoles and 1,2-Dihydrocarbazoles by Domino ‘Twofold Heck-6π-Electrocyclization’ Reactions of Di- and Tribromo-N-methylindoles
作者:Peter Langer、Munawar Hussain、Đãng Tùng
DOI:10.1055/s-0029-1217357
日期:2009.7
palladium(0)-catalyzed Heck cross-coupling reaction of 2,3-dibromo- and 2,3,6-tribromo-N-methylindole, using Pd(OAc) 2 as the catalyst and a novel biaryl monophosphine ligand developed by Buchwald and co-workers, afforded the corresponding di- and trialkenylindoles in high yields. The formation of 1,2-dihydrocarbazoles by a domino 'twofold Heck―6π-electrocyclization' was observed when the reaction was carried
钯 (0) 催化的 2,3-二溴-和 2,3,6-三溴-N-甲基吲哚的 Heck 交叉偶联反应,使用 Pd(OAc) 2 作为催化剂和 Buchwald 开发的新型联芳基单膦配体和同事,以高产率提供了相应的二烯基吲哚和三烯基吲哚。当反应在 120 °C 而不是 90 °C 下进行时,观察到通过多米诺“双重 Heck-6π-电环化”形成 1,2-二氢咔唑。