Methylhydrazine → HCID 9928201, compound

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Reaction Steps

Ethyl 3-(3-methyl-1-oxobutyl)-1-(1-naphthalenylmethyl)-1H-pyrazole-4-carboxylate (1.8 g) and methylhydrazine (0.6 ml) in ethanol (20 ml) were heated underreflux for 16 hours. The solution was cooled and evaporated to a solid, which was purified by chromatography on silica (ethyl acetate:isohexane 2:3) followed by crystallisation from ethyl acetate/cyclohexane to give 2,5-dihydro-5-methyl-7-(2-methylpropyl)-2-(1-naphthalenylmethyl)-4H-pyrazolo[3,4-d]pyridazin-4-one (0.43 g).

Provenance & Evidence