Iodine-Mediated Aryl C−H Amination for the Synthesis of Benzimidazoles and Pyrido[1,2-<i>a</i>
]benzimidazoles
作者:Zhigang Lv、Jing Liu、Wei Wei、Jie Wu、Wenquan Yu、Junbiao Chang
DOI:10.1002/adsc.201600455
日期:2016.9.1
An intramolecular aryl C−H amination reaction has been achieved using molecular iodine as the sole oxidant for the synthesis of benzimidazole derivatives. The required substrates were readily prepared by addition or coupling of arylamines with the corresponding nitriles or aryl iodides. Iodine‐mediated oxidative cyclization of these substrates in the presence of potassium carbonate (K2CO3) as base
使用分子碘作为合成苯并咪唑衍生物的唯一氧化剂,已经实现了分子内芳基CH氨基化反应。通过将芳基胺与相应的腈或芳基碘加成或偶联,可以轻松制备所需的底物。在以碳酸钾(K 2 CO 3)为碱的情况下,这些底物的碘介导的氧化环化作用可提供中等至良好收率的相应产物。此处介绍的无过渡金属协议对空气不敏感,操作简单。这种通用且环保的合成方法学广泛适用于各种N芳基取代的am和吡啶2胺,可直接接触1 H来自相应前体的-苯并[ d ]咪唑和吡啶并[1,2- a ]苯并咪唑衍生物。