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3-Oxo-2-arylhydrazononitriles  1a-c  react readily with chloroacetonitrile, ethyl chloroacetate, and with phenacyl chloride to give 4-aminopyrazoles  4a-e . The pyrazolo[4,3- d ]pyrimidine derivatives  7  and  10  are synthesized via reaction of the aminopyrazole  4b  with phenylisothiocyanate and DMFDMA/NH 4 OAc respectively.

An easy synthesis of 5-functionally substituted ethyl 4-amino-1-aryl- pyrazolo-3-carboxylates: interesting precursors to sildenafil analogues