Chemistry of Heterocyclic Compounds p. 1322 - 1326 (1986)
Update date:2022-08-03
Topics:
Zvezdina, E. A.
Zhdanova, M. P.
Anisimova, O. S.
Nechayuk, I. I.
The reaction of 2,6-diphenylpyrylium perchlorate with semi- and thiosemicarbazides in ethanol leads to 1-carbamoyl- and 1-thiocarbamoyl-3-phenyl-5-phenacyl-4,5-dihydropyrazoles, the cyclization of which yields 2,5-diphenyl-7-oxo(thio)-pyrazolo<1,5-c>pyrimidines.The tautomeric form of the latter is established by comparing their electronic absorption spectra with the spectra of the methyl derivatives.
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