反应详情

温度

200 °C

Potassium fluoride (674 mg, 11.6 mmol) was dried under vacuum and stirring, at 200° C. for 3 h. After cooling to room temperature, a solution of compound 95 (1.00 g, 2.32 mmol) in anhydrous N,N-dimethylformamide (20 mL) was added. The mixture was then heated at 130° C., under argon, for 2 h. After cooling to room temperature, the solvent was evaporated under vacuum and the residue was chromatographed (Al2O3, AcOEt/cyclohexane, 9/1, v/v) to give compound 96 (0.50 g, 1.20 mmol) as a yellow solid. Yield 52%; Rf (Al2O3, AcOEt/cyclohexane, 9/1, v/v) 0.46; mp 88-90° C.; IR (KBr) ν 1105, 1342, 1518, 1656, 2830, 2966, 3405 cm−1; 1H NMR (400 MHz, CDCl3) δ 1.07 (t, 6H, J=7.1 Hz), 2.59 (q, 4H, J=7.1 Hz), 2.69 (t, 2H, J=5.9 Hz), 3.57 (q, 2H, J=5.9 Hz), 7.58 (se, 1H), 7.86 (d, 1H, J=9.0 Hz), 8.06 (dd, 1H, J=1.8, 9.0 Hz), 8.54 (d, 1H, J=1.8 Hz), 9.44 (d, 1H, 4JH-F=10.6 Hz); MS m/z 415 (M+, 1), 299 (3), 145 (1), 118 (3), 86 (100), 58 (9).

1. temperatureAfter cooling to room temperature
2. temperatureThe mixture was then heated at 130° C., under argon, for 2 h
3. temperatureAfter cooling to room temperature
4. customthe solvent was evaporated under vacuum
5. customthe residue was chromatographed (Al2O3, AcOEt/cyclohexane, 9/1