We have developed an effective method for the preparation of 1-alkyl(aryl)-3-[4-(hydroxymethyl)-1Н-pyrazol-3-yl]ureas based on the interaction of 4-hydroxymethylpyrazole-3-carbonyl azides with primary aliphatic and aromatic amines under the conditions of Curtius reaction. In the absence of amines in the reaction mixture, in situ generated 4-hydroxymethyl-3-isocyanatopyrazoles underwent intramolecular cyclization to pyrazolo[3,4-d][1,3]oxazin-6(4Н)-ones. The latter showed a tendency to form 1-alkyl(aryl)-3-[4-(hydroxymethyl)-1Н-pyrazol-3-yl]ureas in the presence of amines.
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*For Communication 8, see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1359-1365, September, 2014.
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Bratenko, M.K., Barus, M.M., Rotar, D.V. et al. Polyfunctional Pyrazoles. 9*. Synthesis of 1-Alkyl(Aryl)-3-[4-(Hydroxymethyl)-1Н-Pyrazol-3-Yl]UReas. Chem Heterocycl Comp 50, 1252–1258 (2014). https://doi.org/10.1007/s10593-014-1587-z
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DOI: https://doi.org/10.1007/s10593-014-1587-z