Pyridine → tert-butyl (1-(4-fluorophenyl)-3-(trifluoromethyl)-1H-pyrazol-5-yl)methylcarbamate

Participants

Reaction Steps

To a mixture of tert-butyl (3-(trifluoromethyl)-1H-pyrazol-5-yl)methylcarbamate (501 mg, 1.89 mmol, 1 equiv.), 4-fluorophenylboronic acid (529 mg, 3.78 mmol, 2 equiv.) and copper acetate (517 mg, 2.83 mmol, 1.5 equiv.) in dichloromethane (28 mL) was added pyridine (301 mg, 0.301 mL, 3.78 mmol, 2 equiv) and the mixture was stirred in the presence of air for 2 d at room temperature. The reaction mixture was filtered over silica gel, the filter cake was washed with 250 mL of dichloromethane and the solvent of the filtrate was evaporated to give tert-butyl (1-(4-fluorophenyl)-3-(trifluoromethyl)-1H-pyrazol-5-yl)methylcarbamate (501 mg, 74%).

Provenance & Evidence