Organocatalytic <i>Para</i>-Selective Amination of Phenols with Iminoquinone Monoacetals
作者:Liu Liu、Kun Chen、Wen-Zhen Wu、Peng-Fei Wang、Hang-Yu Song、Hongbin Sun、Xiaoan Wen、Qing-Long Xu
DOI:10.1021/acs.orglett.7b01700
日期:2017.7.21
A highly selective para C–H amination of unprotected phenols with iminoquinone acetals was realized, giving the functional phenols in good to excellent yields. Overall, this transformation is operationally simple, proceeds with readily available phenols, and has wide substrate scope and low catalyst loading. The biarylamine product is stochastically formed via [5,5]-sigmatropic rearrangement of a mixed
实现了未保护的苯酚与亚氨基醌缩醛的高度选择性对CH氨基胺化反应,使功能性苯酚的收率良好至极佳。总的来说,这种转化操作简单,可以容易获得苯酚,并且底物范围广,催化剂用量低。通过在反应条件下原位生成的混合乙缩醛物种的[5,5]-σ重排随机地形成联芳胺产物。