6-Aminopyrazolo[4,3-c]pyridin-4(5H)-one, a novel analog of guanine

Abstract
Treatment of dimethyl .alpha.-ethoxymethylidineacetonedicarboxylate with hydrazine gave methyl 3-(methoxycarbonylmethyl)pyrazole-4-carboxylate which, upon ammonolysis and dehydration, afforded methyl 3-(cyanomethyl)pyrazole-4-carboxylate. This compound, when heated with liquid ammonia, gave 6-aminopyrazolo[4,3-c]pyridin-4(5H)-one, a new guanine analogue, which did not possess any of the potent antiviral activity shown by 6-aminoimidazo[4,5-c]pyridin-4(5H)-one (3-deazaguanine).

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