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A novel series of interesting N-(pyrazol-5-yl)pyridine-3,5-dicarbonitrile, pyrazolo[1,5-a]pyrido[3,2e]pyrimidine-7-carbonitrile and pyrazolo[4,3-e]pyrido[1,2-a]pyrimidine-6,8-dicarbonitrile derivatives were prepared via the versatile readily accessible 7-aminopyrazolo[1,5-a]pyrimidin-5(4H)-one or 2-cyano-N(pyrazol-5-yl)acetamide derivatives with arylaldehydes and malononitrile in ethanol containing piperidine.

arkivoc

N-(Pyrazol-5-yl)cyanoacetamide in heterocyclic synthesis: synthesis of novel N-(pyrazol-5-yl)pyridine-3,5-dicarbonitrile, pyrazolo[1,5-a]pyrido[3,2-e]pyrimidine-7-carbonitrile and pyrazolo[4,3-e]pyrido[1,2-a]pyrimidine-6,8-dicarbonitrile moieties