Abstract
Reactions of diazomethane with quinone mono(di)imines and methylidene quinone imines of pyrido[1,2-a]benzimidazole series occurs by the route of 1,3-dipolar cycloaddition and leads to the formation of quinoid compounds, in particular, previously unknown heterocyclic structures of indazolo[7',6':4,5]imidazo-[2,1-j]quinoline, indazolo[7',6':4,5]imidazo[2,1-e]acridine, indazolo[4',5':4,5]imidazo[2,1-j]quinoline, and indazolo[4',5':4,5]imidazo[2,1-e]acridine.
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