反应详情

To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-2-methyl-oxirane (51.85 g, 224 mmol) in EtOH (800 ml) was added NaN3 (36.8 g, 531 mmol), NH4Cl (60.6 g, 1122 mmol) and 18-crown-6 (59.8 g, 224 mmol) and the reaction mixture was heated at reflux for 6 h. The reaction mixture was filtered and concentrated to half of its volume. The residual oil was extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.70; HPLC RtH3=1.115 min; 1H NMR (360 MHz, CDCl3): δ 7.72 (dd, 1H), 7.32 (m, 1H), 6.85 (dd, 1H), 3.73 (d, 1H), 3.51 (d, 1H), 2.44 (s, 1H), 1.50 (s, 3H).

1. temperaturethe reaction mixture was heated
2. temperatureat reflux for 6 h
3. filtrationThe reaction mixture was filtered
4. concentrationconcentrated to half of its volume
5. extractionThe residual oil was extracted with EtOAc
6. washCombined extracts were washed with saturated NaHCO3 solution and brine
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated