Cesium carbonate → 1-(2,2-difluoroethyl)-4-nitro-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

4-Nitro-1H-pyrazole (150 mg, 1.33 mmol) and 1,1-difluoro-2-iodo-ethane (509 mg, 2.65 mmol) were dissolved in acetonitrile (5 mL). Cesium carbonate (917 mg, 2.79 mml) was added and the mixture was heated at 100° C. for 40 min. After cooling down to room temperature, the reaction was diluted with sat. ammonium chloride and extracted with methylene chloride (3×). The combined organic layers were dried over sodium sulfate, filtered and the filtrate was concentrated to give 1-(2,2-difluoroethyl)-4-nitro-pyrazole (237 mg) as a light yellow solid.

Provenance & Evidence