To a slurry of 5-methyl-3-(trifluoromethyl)-1H-pyrazole-1-acetic acid (0.23 g, 1.1 mmol) in dichloromethane (5 mL) was added oxalyl chloride (0.20 mL, 14 mmol) and one drop of N,N-dimethylformamide. After 45 minutes the reaction mixture was concentrated in vacuo and the resulting residue was dissolved in dichloromethane (10 mL). The reaction mixture was then added to a solution of ethyl 4-piperidinyl-2H-1,2,3-triazole-4-carboxylate (0.23 g) and triethylamine (0.20 mL, 1.4 mmol) in dichloromethane (10 mL) at 0° C. The reaction mixture was stirred at room temperature overnight. The organic layer was washed with saturated aqueous sodium bicarbonate, dried (Na2SO4) and the solvent was removed with a rotary evaporator. The residue was purified by medium pressure liquid chromatography (MPLC) using 35 to 60% ethyl acetate in hexanes as eluant to afford 0.35 g of the title compound as a white solid.
