反应详情

温度

80 °C

To a 250-mL RB-flask containing tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydro-1(2H)-pyridinecarboxylate (3.09 g, 10.0 mmol), K2CO3 (4.14 g, 30.0 mmol) and PdCl2dppf (419 mg) was added a solution of 2-bromo-4-nitroanisole (2.30 g, 10 mmol) in DMF (10.0 mL) at room temperature under argon. The mixture was heated to 80° C. under argon overnight. After cooled to room temperature, water (500 mL) was added to the mixture. The aqueous layer was extracted with EtOAc (2×200 mL) and the combined organic extracts were dried over K2CO3, filtered and concentrated in vacuo. The crude material was purified on flash chromatography (20% EtOAc/hexane) to give tert-butyl 4-(2-methoxy-5-nitrophenyl)-3,6-dihydro-1(2H)-pyridinecarboxylate (1.51 g, 46%): ESMS m/e: 334.9 (M+H)+.

1. temperatureAfter cooled to room temperature
2. extractionThe aqueous layer was extracted with EtOAc (2×200 mL)
3. dry with materialthe combined organic extracts were dried over K2CO3
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe crude material was purified on flash chromatography (20% EtOAc/hexane)