Abstract
Nitration of 1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one and its N-methyl derivatives at 0–5°C and 60°C gives 5-nitro-and 5,6-dinitro-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones, respectively. The latter can also be obtained by nitration of 5-mononitro derivatives under similar conditions. The nitration of 6-chloro-and 6-bromo-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones and their N-methyl-substituted analogs leads to the formation of the corresponding 6-chloro(bromo)-5-nitro compounds. The same products are formed in the nitration of 5,6-dichloro-and 5,6-dibromo-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones. In this case, the process involves replacement of the halogen atom in position 5 of the pyridine fragment by nitro group. The nitration of 6-bromo-5-methyl-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one is accompanied by oxidation of the 5-methyl group to carboxy.
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Original Russian Text © N.N. Smolyar, Kh.Ya. Lopatinskaya, A.B. Vasilechko, D.A. Lomov, Yu.M. Yutilov, 2007, published in Zhurnal Organicheskoi Khimii, 2007, Vol. 43, No. 3, pp. 418–422.
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Smolyar, N.N., Lopatinskaya, K.Y., Vasilechko, A.B. et al. Nitration of 1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one derivatives. Russ J Org Chem 43, 417–421 (2007). https://doi.org/10.1134/S1070428007030153
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DOI: https://doi.org/10.1134/S1070428007030153