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Facile unequivocal syntheses of the title compounds are reported via “in situ” cyclization of the non‐isolable adducts 2a‐d with α‐halogenated electrophilic compounds. Chemical and spectroscopic evidences for the structures of the new compounds are described.

Facile syntheses of pyrazole, pyridine, pyrimidine and pyrazolo [3,4-d]pyrimidine derivatives have been achieved by the reaction of j3-enamino nitrile 2a with hydrazines, phenyl isothiocyanate, thiourea and active methylene reagents. The~-cnamino ketone 2e with the same reagents affords 3,5-dimethyl heterocyclic ring systems.

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