Cyanogen Bromide → 5-[4-(Trifluoromethyl)phenyl]-1,3,4-oxadiazol-2-amine

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To a solution of 4-(trifluoromethyl)benzohydrazide (0.5 g, 2.449 mmol) in dioxane (10 mL) and water (2 mL) was added sodium bicarbonate (0.617 g, 7.35 mmol) and cyanic bromide (0.519 g, 4.90 mmol). The reaction was stirred at room temperature for 15 h. The reaction mixture was diluted with water (50 mL), extracted with EtOAc, dried over sodium sulfate, and evaporated to yield 5-(4-(trifluoromethyl)phenyl)-1,3,4-oxadiazol-2-amine (0.28, 50%). 1H NMR: 400 MHz, DMSO-d6: δ 7.43 (s, 2H), 7.91 (d, J=8.40 Hz, 2H), 8.00 (d, J=8.40 Hz, 2H). LCMS: RT 1.55 min. LCMS (ES-API), m/z 230.0 (M+H).

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