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Communication | Regular issue | Vol 34, No. 8, 1992, pp.1491-1495
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6045
New Cyclization Reactions of 3-Dialkylamino-4-aminopyridines under Conditions of Nitration

Yutaka Miura,* Sakae Takaku, Yoshiharu Nawata, and Masatomo Hamana

*Production Technology Research Laboratories, Chugai Pharmaceutical Co., Ltd., Ukima 5-1-5, Kita-ku, Tokyo 115, Japan


Treatment of 3-dialkylamiono-4-aminopyridines (1) with nitric and sulfuric acids affords imidazo[4,5-c]pyridine derivatives (2, 3 and 4) and 1,2,3-triazolo[4,5-c]pyridine 2-oxides (5) by cyclization reaction of the corresponding 4-nitroaminopyridines.