To a solution of 5-[3-(4-fluoro-phenyl)-5-methyl-isoxazol-4-ylmethoxy]-2H-pyrazole-3-carboxylic acid (100 mg, 0.32 mmol) in DMF (5 mL) were added 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (152 mg, 0.47 mmol), N,N-diisopropyl ethyl amine (270 μL, 1.6 mmol) and N-aminopyrrolidine HCl (58 mg, 0.47 mmol). The resulting reaction mixture was stirred overnight at room temperature. The reaction mixture was then poured into aqueous sodium chloride (saturated) and extracted with ethyl acetate. The combined organic layers were then washed with water, citric acid solution and saturated sodium hydrogen carbonate solution and then dried over sodium sulfate, filtered and evaporated. Concentration and purification by chromatography (silica, dichloromethane:methanol=100:0 to 9:1) afforded the title compound (91 mg, 75%) as a white solid. MS: m/e=386.2 [M+H]+.
