Abstract
The reaction of substituted 3-methyl-5-pyrazolones with arylidenebisureas has been studied. Substituted spiro[pyrazole-4, 5′-pyrimidines] have been obtained from 1-phenyl- and 1-benzyl-3-methyl-5-pyrazolones. When only one hydrogen atom was present in the ring of the 3-methyl-5-pyrazolone, the corresponding α-ureidobenzyl derivative was obtained.
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Mamaev, V.P., Mikhaleva, M.A. Pyrimidines. Chem Heterocycl Compd 3, 843–845 (1967). https://doi.org/10.1007/BF00474886
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DOI: https://doi.org/10.1007/BF00474886