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

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Reaction Steps

To a solution of 1-phenyl-2-p-tolylethanone (70 mg, 0.33 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (65 mg, 0.33 mmol) and urea (60 mg, 1.0 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 14 (21 mg, yield 14.9%). 1H NMR (DMSO-d6 400 MHz TMS): δ 10.30 (s, 1H), 8.67 (s, 1H), 7.52 (s, 1H), 7.44 (s, 1H), 7.26-7.19 (m, 6H), 6.85-6.70 (m, 4H), 5.16 (s, 1H), 4.05 (s, 2H), 2.12 (s, 3H), 1.33 (t, J=6.4 Hz, 3H); MS (ESI): m/z 446.0 [M+1]+.

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