Under Curtius rearrangement conditions, 2,6-dimethyl-3,5-pyridinedicarboxylic acid azides form the corresponding isocyanates which react in situ with ammonia, primary and secondary amines to form mono-, di-, and trisubstituted ureas. The reaction of the 5-ethoxycarbonyl-2,6-dimethylnicotinic acid azide with imidazole under these conditions gave symmetrical N,N'-bis[5-(ethoxycarbonyl)-2,6-di-methylpyridin-3-yl]ureas.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1272-1281, August, 2012.
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Nesterova, E.Y., Pugacheva, A.S. & Voevudsky, M.V. Substituted ureas based on 2,6-dimethyl-3,5-pyridinedicarboxylic acid azides. Chem Heterocycl Comp 48, 1187–1195 (2012). https://doi.org/10.1007/s10593-012-1120-1
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DOI: https://doi.org/10.1007/s10593-012-1120-1