Ethyl malonyl hydrazide

• As starting reagent in the step-wise construction of complex pyrrole-pyrazole system.,
• Synthesis of 4,5-dihydro-1H-pyrazoles, via reaction with 4-alkoxy-1,1,1-trifluoro-3-alken-2-ones, using conventional thermal heating method and a microwave-assisted method.
• Synthesis of pyrazolopyridazine.

105-53-3

30866-24-1

General procedure for the synthesis of ethyl 3-oxo-3-hydrazinopropionate from diethyl malonate: diethyl malonate (10 g, 62.5 mmol) was dissolved in 50 ml of anhydrous ethanol, followed by slow addition of 85% hydrazine hydrate (1.44 g, 1.44 mol). The reaction mixture was stirred and reacted at room temperature overnight. After completion of the reaction, filtration was carried out and the filtrate was collected. The solvent was removed by distillation under reduced pressure to give the crude product. The crude product was purified by recrystallization with a mixed solvent of ethyl acetate/petroleum ether to finally obtain the target compound ethyl 3-oxo-3-hydrazinopropionate (2.10 g, 64% yield) as a white solid.