Acetic Anhydride → N-(4-(6-(3-ethoxy-4-hydroxy-5-nitrophenyl)-2-oxo-5-phenyl-1,2,3,6-tetrahydropyrimidin-4-yl)phenyl)acetamide

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To a solution of compound 6-(4-aminophenyl)-4-(3-ethoxy-4-hydroxy-5-nitrophenyl)-5-phenyl-3,4-dihydropyrimidin-2(1H)-one (Compound 84) (100 mg, 0.22 mmol) in DCM (2 mL) was added Ac2O (27 mg, 0.27 mmol) at room temperature, and the mixture was stirred at room temperature for 4 hours. The mixture was evaporated in vacuo and purified by column to give the Compound 73 (32.07 mg, yield 34%). 1H NMR (DMSO-d6 300 MHz): δ 10.28 (brs, 1H), 9.95 (s, 1H), 8.66 (s, 1H), 7.52 (s, 1H), 7.45-7.42 (m, 3H), 7.19 (d, J=1.8 Hz, 1H), 7.13-6.97 (m, 5H), 6.83 (d, J=6.6 Hz, 2H), 5.17 (d, J=2.7 Hz, 1H), 4.10-4.01 (m, 2H), 2.02 (s, 3H), 1.33 (t, J=6.9 Hz, 3H); MS (ESI): m/z 489.1 [M+1]+.

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