2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)是一种众所周知的氧化剂。在此,我们报道DDQ可用于在无溶剂机械化学(球磨)条件下通过分子内和分子间C-N偶联反应合成1,2-二取代苯并咪唑和喹唑啉-4(3 H )-酮。在 DDQ 存在下, N -(2-(亚芳基氨基)苯基)-对甲苯磺酰胺的分子内 C(sp 2 )–H 酰胺化生成 1,2-二取代苯并咪唑,以及 2-氨基苯甲酰胺与芳基/烷基醛以高产率产生取代的喹唑啉-4(3 H )-酮衍生物。
An Intramolecular C(sp<sup>2</sup>
)-H Amidation Using <i>N</i>
-Iodosuccinimide
作者:Md Toufique Alam、Saikat Maiti、Prasenjit Mal
DOI:10.1002/ejoc.201800688
日期:2018.8.15
An intramolecular dehydrogenative C(sp2)H–NH coupling reaction is reported under metal‐free conditions, usingN‐iodosuccinimide as the sole reagent. The reactions were carried out in trifluoroethanol as solvent. Several N‐substituted benzimidazoles were obtained in very high yields and short reaction times.