Synthesis of 6-Substituted 2-Pyrrolyl and Indolyl Benzoxazoles by Intramolecular <i>O</i>-Arylation in Photostimulated Reactions
作者:Victoria A. Vaillard、Javier F. Guastavino、María E. Budén、Javier I. Bardagí、Silvia M. Barolo、Roberto A. Rossi
DOI:10.1021/jo202386b
日期:2012.2.3
The synthesis of a series of 6-substituted 2-pyrrolyl and 2-indolyl benzoxazoles by photostimulated C–O cyclization of anions from 2-pyrrole carboxamides, 2-indole carboxamides, or 3-indole carboxamides has been found to proceed in good to excellent yields (41–100%) in DMSO and liquid ammonia. The pyrrole and indole carboxamides are obtained in good to very good isolated yields by an amidation reaction
由2-吡咯甲酰胺,2-吲哚甲酰胺,或3的一系列的阴离子的光刺激C-O环化6-取代的2-吡咯基和2-吲哚基苯并恶唑的合成-吲哚甲酰胺已发现在良好进行到优良DMSO和液氨的收率(41–100%)。通过不同的2-卤代苯胺与吡咯的2-羧酸和吲哚的2-或3-羧酸的酰胺化反应,以良好或非常好的分离产率获得了吡咯和吲哚羧酰胺。为了解释这些反应的区域化学结果(C–O芳基化与C–N或C–C芳基化),使用DFT方法和B3LYP功能进行了理论分析。