Photoinduced, Direct C(sp
<sup>2</sup>
)−H Bond Azo Coupling of Imidazoheteroarenes and Imidazoanilines with Aryl Diazonium Salts Catalyzed by Eosin Y
作者:Sumbal Saba、Caio R. Dos Santos、Bruno R. Zavarise、Aline A. S. Naujorks、Marcelo S. Franco、Alex R. Schneider、Marcos R. Scheide、Ricardo F. Affeldt、Jamal Rafique、Antonio L. Braga
DOI:10.1002/chem.201905308
日期:2020.4.6
Herein, a greener approach to the eosin Y-Na2 catalyzed, C(sp2 )-H bond azo coupling of imidazoheteroarene with aryl diazonium salts is described, under acid free conditions. This direct photoredox process resulted in the corresponding azo products in good to excellent yields. Besides, this new approach could also be applicable to anilines, which is a poorly reactive substrate by other methods. The
在本文中,描述了在无酸条件下,曙红Y-Na 2催化的咪唑杂芳烃的C(sp 2)-H键偶氮偶合与芳基重氮盐的更绿色的方法。这种直接的光氧化还原过程产生了相应的偶氮产物,收率良好至极好。此外,这种新方法也可适用于苯胺,而苯胺是其他方法反应性较差的底物。该反应的主要特征是它提供了高收率,并且是克级可缩放的,并且适用于生物学上相关的咪唑杂杂芳烃和-苯胺。