Electroreductive heterocyclization of ortho-piperidino substituted nitro(het)arenes
作者:Roman S. Begunov、Valeria O. Sakulina、Mikhail A. Syroeshkin、Evgeniya A. Saverina、Alexandr A. Sokolov、Mikhail E. Minyaev
DOI:10.1016/j.mencom.2020.09.027
日期:2020.9
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.