Synthesis of Carbazoles via an Intramolecular Cyclization of 2-(6-Substituted 3(<i>Z</i>)-hexen-1,5-diynyl)anilines and Their Related Molecules
作者:Chia-Ying Lee、Chi-Fong Lin、Jeng-Lin Lee、Ching-Chen Chiu、Wen-Der Lu、Ming-Jung Wu
DOI:10.1021/jo0303158
日期:2004.3.1
Various 2-(6-substituted 3(Z)-hexen-1,5-diynyl)anilines 1a−g were treated with potassium tert-butoxide or potassium 3-ethylpentanoxide in NMP at 60 °C for 2 h to give the corresponding 5-substituted carbazoles 2a−g in 36−65% yields together with indoles 9a−g in 21−40% yields, respectively. Exposing the trifluoroacetamide analogues 10h−k under the same reaction conditions gave the carbazoles 2b−e in 37−57%
将各种2-(6-取代的3(Z)-己烯-1,5-二炔基)苯胺1a - g在60°C的NMP中用叔丁醇钾或3-乙基五氧化钾处理2 h,得到相应的5取代的咔唑2a - g的产率为36-65%,吲哚9a - g的产率为21-40%。在相同反应条件下暴露三氟乙酰胺类似物10h - k得到咔唑2b - e,收率为37-57%,吲哚9b - e收率为15-27%。随后乙酰胺类似物10a - g的环化反应产生咔唑2a - g,收率53-86%。