Metal-Free Oxidative C-H Amidation of<i>N</i>,<i>N′</i>-Diarylureas with PhI(OAc)<sub>2</sub>: Synthesis of Benzimidazol-2-one Derivatives
作者:Jipan Yu、Chang Gao、Zhixuan Song、Haijun Yang、Hua Fu
DOI:10.1002/ejoc.201500726
日期:2015.9
compounds or intramolecular N-arylations using substrates with carbon-halogen bonds. However, the starting materials of these protocols are often not readily available. Herein, a simple and practical metal-free oxidative C–H amidation of N,N′-diarylureas has been developed that takes place at room temperature. This protocol uses readily available N,N′-diarylureas as the starting materials and inexpensive
苯并咪唑-2-酮具有多种生物学功能,通常通过取代苯-1,2-二胺与含羰基化合物的反应或分子内N-芳基化反应制备,使用具有碳-卤键的底物。然而,这些协议的起始材料通常不容易获得。在此,开发了一种在室温下进行的简单实用的 N,N'-二芳基脲的无金属氧化 C-H 酰胺化反应。该协议使用现成的 N,N'-二芳基脲作为起始材料,使用廉价的 PhI(OAc)2 作为氧化剂,无需催化剂、配体或排除空气。本方法具有广泛的官能团耐受性,为合成 N-杂环提供了一种新的实用策略。