Ethyl propiolate → HCID 178448514, compound

Participants

Reaction Conditions

Reaction Steps

t-Butylhydrazine hydrochloride (4.5 g, 35.7 mmol) was suspended in t-butanol (35 ml) at room temperature in a dry nitrogen atmosphere. The mixture was warmed to 35° C., ethyl propiolate (3.85 g, 39.3 mmol) dropwise added and, after ice cooling, potassium t-butoxide (13.8 g, 107 mmol) was slowly added in small portions. The resulting mixture was stirred overnight at room temperature. The solvent was evaporated in vacuo, water added to the residue and extracted with dichloromethane. The aqueous phase was acidified by addition of acetic acid, evaporated to dryness in vacuo and the residue was extracted several times with ethyl acetate. The combined organic phases were dried over sodium sulphate, filtered and evaporated yielding 53 mg of 1-tert-butyl-1H-pyrazol-3-ol as a beige colour solid.

Provenance & Evidence