Abstract
It is shown that contraction of the pyrimidine ring occurs when 6-nitro-7-oxo-4,7-dihydroazolo[1,5-a]pyrimidines are heated with hydrazine hydrate. Complexes of 4-nitropyrazole with 5-aminoazoles, the structures of which were proved by x-ray diffraction analysis, are formed in a similar reaction of nitrosubstituted azolopyrimidines that do not contain an oxo function.
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See [1] for Communication 14.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 665–668, May, 1991.
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Rusinov, V.L., Myasnikov, A.V., Chupakhin, O.N. et al. Nitroazines. 15. Contraction of the pyrimidine ring in 6-nitroazolo[1,5-a]pyrimidines. Chem Heterocycl Compd 27, 530–533 (1991). https://doi.org/10.1007/BF00474001
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DOI: https://doi.org/10.1007/BF00474001