反应详情

To a solution of (S)-tert-butyl 1-(benzyloxy)-3-hydroxypropan-2-ylcarbamate (1.89 g, 6.4 mmol) in DCM (50 mL) was added MSCl (0.55 mL, 7.04 mmol) and DIEA (1.27 mL, 7.68 mmol). The mixture was stirred at RT for 30 min. The mixture was diluted with DCM (300 mL), washed with NaHCO3 and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was dissolved in DMF (20 mL). To this DMF solution was added NaN3 (1.25 g, 19.2 mmol) and the mixture was heated to 80° C. for 6 h. LCMS indicated the completion of the reaction. The mixture was cooled to RT, water (20 mL) and EtOAc (200 mL) were added. The organic layer was separated, washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The rude was purified on silica gel column to give (S)-tert-butyl 1-azido-3-(benzyloxy)propan-2-ylcarbamate (1.5 g, 73% for 2 steps).

1. washwashed with NaHCO3 and brine
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. dissolutionThe crude product was dissolved in DMF (20 mL)
6. temperaturethe mixture was heated to 80° C. for 6 h
7. customthe completion of the reaction
8. temperatureThe mixture was cooled to RT
9. customThe organic layer was separated
10. washwashed with NaHCO3, brine
11. dry with materialdried over Na2SO4
12. filtrationfiltered
13. concentrationconcentrated under reduced pressure
14. customThe rude was purified on silica gel column