ethyl 2-(5-oxo-1,4-dihydropyrazol-3-yl)acetate

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 3-(ethoxycarbonylmethyl)-2-pyrazolin-5-one (1 g, 5.8 mmol) and NaCN (28 mg, 0.58 mmol) in 30 ml of 9M ammonia in MeOH was heated to 45° C. in sealed tube for 3 days. After cooling, the solvent was evaporated and the residue was suspended in water. The precipitated solid was collected by filtration. After cooling the solvent was evaporated The precipitated solid was collected by filtration