1-(4-Fluoro-3-cyanophenyl)-3-trifluoromethyl-5-hydroxymethylpyrazole → 1-(3-Cyano-4-fluorophenyl)-3-trifluoromethyl-5-hydroxycarbonylpyrazole

Participants

Reaction Steps

To a solution of 1-(4-fluoro-3-cyanophenyl)-3-trifluoromethyl-5-hydroxymethylpyrazole (0.45 g, 1.58 mmol) in acetonitrile (10 mL) was added catalytic amount of ruthenium chloride at 0° C. followed by addition of a solution sodium periodate (0.71 g, 3.32 mmol) in water. The reaction was stirred at 0° C. to room temperature overnight. The next day the acetonitrile was evaporated and the residue was partitioned between ethyl acetate and water, washed with brine, dried over sodium sulfate, filtered and concentrated to give 1-(4-fluoro-3-cyanophenyl)-3-trifluoromethyl-5-hydroxycarbonylpyrazole (0.27 g, 57% yield) as pure compound: MS (ES−): 298 (M−H)− (40%).

Provenance & Evidence