反应详情

温度

80 °C

To a 150-mL RB-flask containing tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydro-1(2H)-pyridinecarboxylate (5.58 g, 16.5 mmol), K2CO3 (5.60 g, 40.5 mmol) and PdCl2dppf (1.48 mmol, 1.21 g) was added a solution of 4-bromo-1-fluoro-2-nitrobenzene (3.30 g, 15.0 mmol) in DMF (50.0 mL) at room temperature under argon. The mixture was heated to 80° C. under argon for 12 hours. After cooling to room temperature, the mixture was filtered through Celite and the Celite was washed with EtOAc (3×100 mL). The filtrates were washed with H2O (3×200 mL), brine (100 mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (EtOAc/hexanes 1:9) to afford tert-butyl 4-(4-fluoro-3-nitrophenyl)-3,6-dihydro-1(2H)-pyridinecarboxylate (3.13 g, 65.1%): 1H NMR (400 MHz, CDCl3) δ 8.06-7.89 (m, 1H), 7.66-7.49 (m, 1H), 7.30-7.10 (m, 1H), 6.19-5.95 (br, 1H), 4.10-3.95 (m, 2H), 3.58 (t, 2H, J=5.6 Hz), 2.49-2.34 (m, 2H), 1.42 (s, 9H).

1. temperatureAfter cooling to room temperature
2. filtrationthe mixture was filtered through Celite
3. washthe Celite was washed with EtOAc (3×100 mL)
4. washThe filtrates were washed with H2O (3×200 mL), brine (100 mL)
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude material was purified by flash chromatography (EtOAc/hexanes 1:9)