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

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Reaction Steps

To a solution of 1-(3,5-difluorophenyl)-2-phenylethanone (Intermediate 18) (100 mg, 0.43 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (84.9 mg, 0.43 mmol), and urea (78.6 mg, 1.29 mmol) in 5 mL of ethanol was added 0.2 mL of concentrated HCl, and the mixture was refluxed 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 46 (40 mg, yield 19.9%). 1H NMR (DMSO-d6 400 MHz) δ 10.27 (s, 1H), 8.81 (s, 1H), 7.56 (s, 1H), 7.41 (s, 1H), 7.31 (m, 2H), 7.14 (s, 1H), 7.11-6.99 (m, 4H), 6.86 (d, J=7.2 Hz, 2H), 5.24 (s, 1H), 4.04 (m, 2H), 1.32 (t, J=7.2 Hz, 3H); MS (ESI): m/z 468.0 [M+1]+.

Provenance & Evidence