反应详情

温度

70 °C

4-Bromo-2-fluoro-1-nitrobenzene (5.3 g, 24.1 mmol) was dissolved in acetonitrile (70 mL) and water (10 mL). To this mixture, potassium carbonate (10 g, 72.3 mmol) and 2-(4-(tert-butoxycarbonyl)piperazin-2-yl)acetic acid (7.1 g, 28.9 mmol) were added. The resulting mixture was heated at 70° C. for 2 days. The mixture thus obtained was concentrated and ethyl acetate was added. 1 N HCl was then added slowly to the reaction solution until pH=6. The water layer was separated and washed multiple times with ethyl acetate. The organic layers thus obtained were combined and concentrated. The crude material thus obtained was purified by silica gel chromatography eluting with a gradient of 0% to 10% of methanol in dichloromethane to afford the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 12.28 (br s), 7.71-7.83 (m, 1 H), 7.56-7.66 (m, 1 H), 7.30-7.40 (m, 1 H), 3.56-3.82 (m, 3 H), 3.33-3.44 (m, 1 H), 2.99-3.24 (m, 2 H), 2.87 (m, 1 H), 2.32-2.47 (m, 1 H), 2.17-2.29 (m, 1 H), 1.32-1.51 (s, 9 H); MS (DCI+) m/z 444.1 (M+H)+.

1. customThe mixture thus obtained
2. concentrationwas concentrated
3. additionethyl acetate was added
4. addition1 N HCl was then added slowly to the reaction solution until pH=6
5. customThe water layer was separated
6. washwashed multiple times with ethyl acetate
7. customThe organic layers thus obtained
8. concentrationconcentrated
9. customThe crude material thus obtained
10. customwas purified by silica gel chromatography
11. washeluting with a gradient of 0% to 10% of methanol in dichloromethane