2-(Ethoxymethylidene)-3-oxobutanenitrile → 4-Acetyl-5-amino-1-(3-chloro-4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-2-yl)pyrazole

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Reaction Steps

0.56 g (3 mmol) 3-Chloro-2-hydrazino-4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine was dissolved in 5 ml ethanol and treated with 0.42 g (3 mmol) 2-ethoxymethylen-3-oxobutyronitrile. After heating under reflux for 3 hours, the mixture was concentrated and the residue purified by silica gel chromatography (hexane/ethyl acetate 1:1).

Provenance & Evidence