To a stirred solution of (3-(trifluoromethyl)-1H-pyrazol-5-yl)methanamine hydrochloride (194 mg, 0.96 mmol) and 2-(3-fluoro-4-(methylsulfonylmethyl)phenyl)propanoic acid (250 mg, 0.96 mmol) in THF (7.4 mL) were added O-(1H-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluorborat (308 mg, 0.96 mmol), 1-hydroxybenzotriazole (135 mg, 0.96 mmol) and N-ethyldiisopropylamine (0.491 mL, 2.881 mmol). The reaction mixture was stirred for overnight at room temperature, concentrated in vacuo, purified by CC (eluent: ethyl acetate/cyclohexane (9:1)) to give 2-(3-fluoro-4-(methylsulfonylmethyl)phenyl)-N-((3-(trifluoromethyl)-1H-pyrazol-5-yl)methyl)propanamide (335 mg, 86%).
