1,4-Dioxane → benzyl 4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)benzylcarbamate

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In a 50 mL round bottomed flask, equipped with a magnetic stir bar, 3-bromo-1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazole (C1) (1.0 g, 3.3 mmol), benzyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzylcarbamate (C13) (1.3 g, 3.6 mmol), bistriphenylphosphine dichloropalladium(II) (0.120 g, 0.171 mmol), and potassium phosphate (1.38 g, 6.49 mmol) were charged as solids. The flask was sealed and placed under nitrogen atmosphere. Dioxane (17.3 mL) and water (4.3 mL) were added. The reaction was warmed to an internal temperature of 65° C. for 18 hours. The reaction mixture was cooled to room temperature, poured into a brine solution and extracted with ethyl acetate (3×75 mL). The combined organic layers were dried over anhydrous magnesium sulfate, filtered, and concentrated. The resulting residue was purified via flash column chromatography using 0-50% ethyl acetate/hexanes as eluent to afford the title compound as a white solid (0.850 g, 56%): 1H NMR (400 MHz, DMSO-d6) δ 9.40 (s, 1H), 8.17-8.00 (m, 4H), 7.91 (t, J=6.2 Hz, 1H), 7.72-7.59 (m, 2H), 7.46-7.12 (m, 7H), 5.07 (s, 2H), 4.29 (d, J=6.1 Hz, 2H); 19F NMR (376 MHz, DMSO-d6) δ −56.96; ESIMS m/z 469 ([M+H]+).

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