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This compound was prepared, starting from compound 38 (0.26 g, 1.02 mmol), according to the procedure developed for compound 10. Reaction time under reflux: 24 h; the purification was performed using column chromatography (Al2O3, CH2Cl2/EtOH, 98/2, v/v) to give compound 39 (236 mg, 0.45 mmol) as a beige solid. Yield 63%; Rf (Al2O3, CH2Cl2/EtOH, 98/2, v/v) 0.50; mp 146-148° C.; IR (KBr) ν 1524, 1542, 1662, 2800-3000, 3335, 3388 cm−1; 1H NMR (200 MHz, CDCl3) δ 1.02 (t, 3H, J=7.1 Hz), 2.65 (q, 2H, J=7.1 Hz), 2.79 (m, 4H), 3.59 (m, 4H), 7.33 (s, 1H), 7.52 (d, 1H, J=5.1 Hz), 7.64 (d, 2H, J=8.8 Hz), 8.01 (dd, 1H, J=1.7, 8.8 Hz), 8.14 (d, 1H, J=5.1 Hz), 8.22 (m, 1H), 8.55 (d, 1H, J=1.7 Hz), 9.48 (s, 1H); ESI-MS m/z 537.0 [M+H]+.

1. customThis compound was prepared
2. customReaction time
3. temperatureunder reflux
4. custom24 h
5. customthe purification