To a solution of ethyl 5-[3-(trifluoromethoxy)phenoxy]-2H-1,2,3-triazole-4-carboxylate (i.e. the product of Step E, 0.55 g, 1.7 mmol) in N,N-dimethylformamide (5 mL) was added anhydrous potassium carbonate (0.48 g, 3.5 mmol) and 4-fluoro-3-nitrobenzotrifluoride (0.29 mL, 2.1 mmol). The mixture was heated to 80° C. with stirring for 90 min. The reaction mixture was concentrated to dryness under reduced pressure. The resulting residue was diluted with water (10 mL) and extracted with ethyl acetate (30 mL, 15 mL). The organic layer was dried (MgSO4) and concentrated under reduced pressure to afford the crude product. The crude material was purified by chromatography on silica gel eluting with 0 to 20% ethyl acetate in hexanes to obtain the title compound (0.76 g) as a pale yellow oil.
