Indium-mediated one-pot benzimidazole synthesis from 2-nitroanilines or 1,2-dinitroarenes with orthoesters
作者:Jaeho Kim、Jihye Kim、Hyunseung Lee、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tet.2011.08.017
日期:2011.10
One-pot reduction-triggered heterocyclizations from 2-nitroanilines or 1,2-dinitroarenes to benzimidazoles were investigated in this study. In the presence of indium/AcOH in ethyl acetate at reflux, reaction of 2-nitroanilines or 1,2-dinitroarenes with R–C(OMe)3 (R=Me, Ph) produced excellent yields of the corresponding benzimidazoles within 30 min to 6 h depending on the substituents of the starting
Synthesis of benzimidazoles by potassium tert-butoxide-promoted intermolecular cyclization reaction of 2-iodoanilines with nitriles
作者:Shi-Kai Xiang、Wen Tan、Dong-Xue Zhang、Xian-Li Tian、Chun Feng、Bi-Qin Wang、Ke-Qing Zhao、Ping Hu、Hua Yang
DOI:10.1039/c3ob41479e
日期:——
The synthesis of benzimidazoles by intermolecular cyclization reaction of 2-iodoanilines with nitriles has been developed. These reactions proceeded without the aid of any transition metals or ligands and just using KOBut as the base. A variety of substituted benzimidazole derivatives can be synthesized by the approach.