Unexpected domino reaction of 3-alkyl-1,2,4-triazolo[1,5-a]benzimidazoles with butylmagnesium bromide leading to benzimidazolyl guanidines

摘要

Reaction of 3-alkyl-1,2,4-triazolo[1,5-a]benzimidazoles with butylmagnesium bromide follows two hetarylotropic rearrangements to afford 1,2-bis(1H-benzhnidazol-2-yl)-1,3-dialkylguanidines and 2-(1'H-1,2'-dibenzimidazol-2-yl)-1,3-dialkylguanidines.