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A series of pyrimidinone and dipyrimidinone derivatives 2a-c, 4a-e and 6a-f has been synthesized via the reaction between ethyl 2,2-dicyano-1-aryl(or alkyl)vinylcarbamate derivatives 1a-d and hydrazine derivatives or  diamines. The reactivity of compounds 1a-d toward hydrazine is studied. The result is the formation of triazolones 5a-d rather than pyrimidinone derivatives.

Reactivity of Hydrazine, Some Hydrazine derivatives and Diamines toward Ethyl 2,2-Dicyano-1-aryl (or alkyl)vinylcarbamate