Citric Acid → 6-fluoro-4-hydroxy-4-phenyl-3-(2,2,2-trifluoroethyl)-3,4-dihydroquinazolin-2(1H)-one

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To a suspension of N-(2-benzoyl-4-fluorophenyl)-1H-imidazole-1-carboxamide (30.00 g, 97.00 mmol) in THF (300 mL) was added 2,2,2-trifluoroethylamine (11.53 g, 116.39 mmol). The reaction was heated to 50° C. After 19 h at 50° C., the reaction was cooled to ambient temperature. Butyl chloride (500 mL) and 10% citric acid (250 mL) were added and the reaction stirred vigorously for 40 min. The precipitate was then isolated by vacuum filtration and placed under vacuum alongside P2O5 for 16 h to give 6-fluoro-4-hydroxy-4-phenyl-3-(2,2,2-trifluoroethyl)-3,4-dihydroquinazolin-2(1H)-one as a yellow solid. 1H NMR (CDCl3, 400 MHz) 8.59 (s, NH); d (7.47, J=6.96 Hz, 2H, ArH); 7.36 (m, 3H, ArH); 6.99 (m, 2H, ArH); 6.79 (m, 1H, ArH); 4.39 (m, 1H, CH2); 3.56 (m, 1H, CH2); 3.23 (s, OH); MS (Electrospray): m/z 363.0 (M+Na).

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