Carbon tetrabromide → 3-(4-bromomethylphenyl)-1-(4-trifluoromethoxyphenyl)-1H-[1,2,4]triazole

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To a solution of {4-[1-(4-trifluoromethoxyphenyl)-1H-[1,2,4]triazol-3-yl]-phenyl}-methanol (P-6; 5.033 g, 15.01 mmol) in THF (100 mL) was added triphenylphosphine (6.009 g, 22.91 mmol). Carbon tetrabromide (7.704 g, 23.23 mmol) dissolved in THF (20 mL) was then added dropwise at room temperature. The mixture was allowed to stir at room temperature for 23 h. It was then filtered through Celite, and the solvent was evaporated at room temperature under vacuum. The crude material was purified by silica gel chromatography, eluting with 50% EtOAc/hexane going to 70% EtOAc/hexane and then 100% EtOAc in a two-step gradient. The title product (4.61 g, 77%) was isolated as a beige solid: mp 124-126° C.; 1H NMR (300 MHz, CDCl3) δ 8.59 (s, 1H), 8.25-8.13 (m, 2H), 7.89-7.72 (m, 2H), 7.60-7.47 (m, 2H), 7.47-7.34 (m, 2H), 4.57 (s, 2H); ESIMS m/z 400 (M+2H), 399 (M+H).

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