Application of 7-<i>endo</i>-<i>trig</i>Pictet-Spengler Cyclization to the Formation of the Benzazepine Ring: Synthesis of Benzazepinoindoles
作者:Sudhir K. Sharma、Sunil Sharma、Piyush K. Agarwal、Bijoy Kundu
DOI:10.1002/ejoc.200801201
日期:2009.3
The preparation of benzazepinoindoles, fused heterocycles with a benzazepine moiety, was accomplished through an intramolecular 7-endo-trig Pictet–Spengler cyclization. The precursors comprising C-3- or C-2-linked o-aminobenzylindoles required for the cyclization were obtained either by treating indoles with o-nitrobenzyl bromide followed by reduction of the nitro group or by treating 2-nitrophenylacetic
苯并氮杂吲哚(具有苯并氮杂部分的稠合杂环)的制备是通过分子内 7-endo-trig Pictet-Spengler 环化完成的。环化所需的包含 C-3-或 C-2-连接的邻氨基苄基吲哚的前体通过用邻硝基苄基溴处理吲哚然后还原硝基或用 DCC/DMAP 处理 2-硝基苯乙酸然后再获得通过芳基硝基官能团的还原。然后将所得底物 5 和 6 与各种醛和酮进行 7-endo-trig Pictet-Spengler 反应,以提供新的多环结构苯并氮杂吲哚。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)