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

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A mixture of 2-phenyl-1-(pyridin-3-yl)ethanone (Intermediate 31) (110 mg, 0.56 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (107 mg, 0.51 mmol), urea (91 mg, 1.52 mmol), and concentrated HCl solution (0.04 mL, 0.56 mmol) in EtOH (5 mL) was refluxed overnight. The mixture was evaporated in vacuo and purified by preparative HPLC to give Compound 65 (46.21 mg, yield 21%). 1H NMR (DMSO-d6 400 MHz): δ 10.28 (s, 1H), 8.91 (s, 1H), 8.46 (d, J=5.2 Hz, 1H), 8.36 (s, 1H), 7.71 (d, J=7.2 Hz, 1H), 7.59 (s, 1H), 7.43 (s, 1H), 7.36 (t, J=5.2 Hz, 1H), 7.15 (s, 1H), 7.09-7.04 (m, 3H), 6.86 (d, J=6.8 Hz, 2H), 5.29 (d, J=2.0 Hz, 1H), 4.04 (q, J=6.8 Hz, 2H), 1.33 (t, J=6.8 Hz, 3H); MS (ESI): m/z 433.0 [M+1]+.

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