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이창희,백호진,김국진,조규욱,오경택,Lee, Chang-Hee,Baik, Ho-Jin,Kim, Kuk-Jin,Cho, Kiu-Uk,Oh, Kyung Taek Korean Chemical Society 1995 대한화학회지 Vol.39 No.5
A few t-amine substituted anilines and amides were synthesized and cyclized to pyrrolo[1,2-a]benzimidazole by heating in various solvents having different polarity. Subsequent nitration of cyclized compound followed by reduction and oxidation of resulting amine afforded quinone such as 7 in 14% yield. The formation of imidazole moiety by thermal cyclization was independent on the solvent polarity. The regiochemistry for the nitration of 4 was unambiguously determined by chemical transformation.