反应详情

温度

0 °C

A stirring solution of 3-(2,6-dichloro-benzyloxy)-pyridin-2-ylamine (32.4 g, 0.11 mol) in acetonitrile was cooled to 0° C. using an ice bath. To this solution was added N-bromosuccinimide (19.5 g, 0.11 mol) portionwise. The reaction was stirred at 0° C. for 15 min. The reaction was concentrated to dryness under vacuum. The resulting dark oil was dissolved in EtOAc (500 mL) and partitioned with H2O (250 mL). The organic was then washed with sat'd NaHCO3 (2×200 mL) and brine (1×200 mL). Activated charcoal was added to the organic layer and warmed to reflux. The solution was then cooled to room temperature and filtered through a pad of celite. The organic was then concentrated to dryness under vacuum to one third the original volume. The solids were then filtered off to yield 5-bromo-3-(2,6-dichloro-benzyloxy)-pyridin-2-ylamine (22.0 g, 0.07 mol, 64%) as a tan solid. The remaining filtrate was concentrated under vacuum to yield crude 5-bromo-3-(2,6-dichloro-benzyloxy)-pyridin-2-ylamine (12.19, 0.04 mol, 35%) as a brown solid.

1. concentrationThe reaction was concentrated to dryness under vacuum
2. dissolutionThe resulting dark oil was dissolved in EtOAc (500 mL)
3. custompartitioned with H2O (250 mL)
4. washThe organic was then washed with sat'd NaHCO3 (2×200 mL) and brine (1×200 mL)
5. additionActivated charcoal was added to the organic layer
6. temperaturewarmed to reflux
7. temperatureThe solution was then cooled to room temperature
8. filtrationfiltered through a pad of celite
9. concentrationThe organic was then concentrated to dryness under vacuum to one third the original volume
10. filtrationThe solids were then filtered off