AZINES AND THEIR ACYCLIC DERIVATIVES AS TRANSFERERS OF ONE-CARBON FRAGMENT IN REACTIONS WITH PYRAZOLONES

Enehydrazine derivatives have been obtained by the reaction of 6-phenyl-1,2,4-triazine 4-oxide with pyrazolones 2, which on further heating with pyrazolones 2 are converted into the corresponding symmetrical or unsymmetrical derivatives of dipyrazolylmethane. Enehydrazine derivatives of 1,3-dimethyl-5-nitrosouracil and 1,3-dimethylimidazolidine interact with 3-methyl-1-phenyl-5-pyrazolone (2a) with the formation of dipyrazolylmethane derivative. On interacting compound 2a or 3-methyl-1-(p-nitrophenyl)-5-pyrazolone with 3,6-diphenyl-1,2,4-triazine 4-oxide 12 the corresponding 4,4'-bispyrazolones are formed, but the interaction of compound 12 with 3-(p-nitrophenyl)-1-phenyl-5-pyrazolone leads to dipyrazolylmethane derivative. Dipyrazolylmethane derivative is obtained on heating of fervenulin 4-oxide, 2,4-dihydroxy-5-nitropyrimidine, and 1,3,5-triazines: 6-azauracil, 5-azauracil, azacytosine, and 2,4-diamino-s-triazine with pyrazolone 2a.