To a solution of 1-(3-fluorophenyl)-5-iodo-1H-pyrazol-3-ylamine (263 mg) in ethylene glycol dimethyl ether (5 ml) were sequentially added 3-(trifluoromethoxy)phenylboronic acid (197 mg), a 2M aqueous solution of sodium carbonate (2.5 ml), tricyclohexylphosphine (49 mg), palladium acetate (20 mg), and the mixture was stirred for 2 hours at reflux. This reaction mixture was cooled to room temperature, a saturated aqueous solution of sodium hydrogen carbonate was added thereto, and then the mixture was filtered through Celite. The filtrate was extracted with ethyl acetate, the resulting organic layer was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=2/1) to give the titled compound (234 mg).
