反应详情

温度

60 °C

In a 2-L RBF, a mixture of 5-bromopyridin-2(1H)-one (30 g, 172 mmol) in DME (250 mL) and DMF (70 mL) was purged with nitrogen and cooled in an ice bath. NaH (60% dispersion, 8.0 g, 200 mmol) was added in small portions to the mixture (over 2 h), resulting in a yellow suspension. LiBr (35 g, 403 mmol) was added and the mixture was stirred at room temperature for 15 min before 4-(2-bromoethoxy)-7-methoxyquinoline (40.0 g, 142 mmol) was added. The mixture was then heated to 60° C. in an oil bath for 5 days. The mixture was cooled to room temperature. CH2Cl2 (300 mL) was added and the slurry was filtered through a pad of Celite. The filtrate was washed with NaOH (0.5 N, 3×150 mL), H2O (100 mL), and dried over Na2SO4. The solution was concentrated to give a soft sludge which was stirred with a mixture of hexane (150 mL)-THF (150 mL) at reflux. The mixture was let cooled to room temperature overnight. The soft cake was filtered and washed with 1:1 hexane-THF (100 mL) to afford the product as a white solid (35.5 g, 67%).

1. customwas purged with nitrogen
2. temperaturecooled in an ice bath
3. customresulting in a yellow suspension
4. additionwas added
5. temperatureThe mixture was cooled to room temperature
6. filtrationthe slurry was filtered through a pad of Celite
7. washThe filtrate was washed with NaOH (0.5 N, 3×150 mL), H2O (100 mL)
8. dry with materialdried over Na2SO4
9. concentrationThe solution was concentrated
10. customto give a soft sludge which
11. temperatureat reflux
12. temperatureThe mixture was let cooled to room temperature overnight
13. filtrationThe soft cake was filtered
14. washwashed with 1:1 hexane-THF (100 mL)