Electroreductive heterocyclization of ortho-piperidino substituted nitro(het)arenes
摘要:
Electrochemical reduction of ortho-piperidino substituted nitro(het)arenes in an undivided cell on a lead cathode in 8% HCl gave either 1,2,3,4-tetrahydropyrido[1,2-a]-benzimidazoles or 6,7,8,9-tetrahydropyrido[3',2':4,5]imidazo[1,2-a]-pyridines. The reductive heterocyclization mechanism involves the initial formation of a nitroso derivative followed by the formation of an imidazole ring.
Study of the Effect of Substituents of ortho-Phenylenediamines in the Opening of Lactones and Lactams for Access to Benzimidazol-2-yl Alkanols and Benzimidazol-2-yl Alkylamines
作者:Laurence Goossens、Omar Castillo-Aguilera、Patrick Depreux、Alexia Ballée、Florian Beaurain、Paola B. Arimondo
DOI:10.1055/s-0040-1707112
日期:2020.7
study of the effect of different electron-withdrawing or electron-donating groups at the 4-position of ortho-phenylenediamines on the opening of lactones or lactams to synthesize benzimidazol-2-yl alkanols and benzimidazol-2-yl alkylamines.
Iodine(III)-Catalyzed Oxidative Cyclization of Aryl Amines to Construct N-Alkylbenzimidazoles
作者:Carmen Margaret White、Sherlyn Cazares、Efren D. Gonzalez-Cortes、Tom G. Driver
DOI:10.1021/acs.joc.4c00346
日期:2024.5.3
An I(III)-catalyzed oxidative cyclization reaction using selectfluor as the oxidant was developed that converts ortho-substituted anilines to benzimidazoles. The mild reaction requires as little as 0.5 mol % of iodobenzene, and its scope is broad: electron-withdrawing or electron-releasing groups on the aniline portion are tolerated, and cyclic or acyclic N-alkylamines are permitted as ortho-substituents