Substituted 5-amino-4-arylpyrazoles on condensation with itaconic acid form substituted tetrahydropyrazolo[1,5-a]pyrimidines, and on condensation with maleic anhydride form 2,3-dihydro-1H-imidazolo[1,2-b]pyrazoles, which on more extended heating rearrange into tetrahydro-pyrazolo[1,5-a]pyrimidines.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1065-1072, July, 2013.
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Filimonov, S.I., Korsakov, M.K., Chirkova, Z.V. et al. Condensation of 5-amino-4-arylpyrazoles with itaconic acid and maleic anhydride. Chem Heterocycl Comp 49, 993–999 (2013). https://doi.org/10.1007/s10593-013-1337-7
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DOI: https://doi.org/10.1007/s10593-013-1337-7