Abstract
The reaction of 3-hydrazino derivative 1 with phenyl isothiocyanate afforded the corresponding thiocarbamoylhydrazine. Subsequent ring closure in basic medium yielded the 1,2,4-triazolo derivative 3 . Condensation of 1 with ethyl chloroformate produced N`-diethyoxycarbonyl derivative 4 . Condensation with p-nitrobenzaldehyde, with a number of monosaccharides and with pyruvic acid, compound 1 afforded the respective hydrazones 5a-g . Cyclodehydration of 5a and 5e gave the corresponding tri-azolo and triazine derivatives 6 and 7 respectively. Heating 1 and a-dicarbonyl compounds gave the tricyclic pyridazinopyrazoloytriazines 8a-c . Reaction of 1 with diethyl oxalate gave triazinedione 9 . The hydrazine 1 cyclized with active methylene compounds to produce the corresponding pyrazolyl derivatives and some related compounds are described.
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