Hydrochloric Acid → 4-(3-ethoxy-4-hydroxy-5-nitrophenyl)-5-(2-fluorophenyl)-6-phenyl-3,4-dihydropyrimidin-2(1H)-one

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To a solution of 2-(2-fluorophenyl)-1-phenylethanone (200 mg, 0.93 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (196 mg, 0.93 mmol) and urea (846 mg, 1.4 mmol) in 20 mL of ethanol was added 0.2 mL of concentrated HCl, the mixture was stirred at reflux for 2 days. After the solvent was removed under reduced pressure, the residue was purified by reverse-phase preparatory HPLC (26-53% acetonitrile+0.1% trifluoroacetic acid in water+0.1% trifluoroacetic acid, over 15 min.) to give Compound 13 (100 mg, yield 23.8%). 1H NMR (DMSO-d6 400 MHz): δ 10.26 (s, 1H), 8.81 (s, 1H), 7.53 (s, 1H), 7.35 (d, J=1.6 Hz, 1H), 7.22-6.87 (m, 7H), 5.22 (s, 1H), 4.00 (m, 2H), 1.31 (t, J=7.2 Hz, 3H); MS (ESI): m/z 450.2 [M+1]+.

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