反应详情

N-Bromosuccinimide (6.0 g, 33 mmol) was added in portions over 1 minute to a solution of 3-(7-benzyl-9-oxa-3,7-diazabicyclo[3.3.1]non-3-yl)propionamide (see step (i) above; 5 g, 12 mmol) in potassium tert-butoxide in tert-butanol (1 M, 81 mL) and tert-butanol (20 mL). The mixture was then heated at 60–65° C. for 30 minutes. The reaction was allowed to come to room temperature and then water (100 mL) was added. The mixture was extracted with ethyl acetate (2×50 mL). The combined organic extracts were washed with brine (50 mL), dried over magnesium sulfate, filtered (washing the filter cake with ethyl acetate (50 mL)) and then the filtrate concentrated under reduced pressure to give the title compound as a brown oil (6.5 g, >100%).

1. temperatureThe mixture was then heated at 60–65° C. for 30 minutes
2. customto come to room temperature
3. extractionThe mixture was extracted with ethyl acetate (2×50 mL)
4. washThe combined organic extracts were washed with brine (50 mL)
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered (
7. washwashing the filter cake with ethyl acetate (50 mL)) and then the filtrate
8. concentrationconcentrated under reduced pressure