反应详情

温度

0 °C

(S)-tert-butyl (1-(3-fluoro-5-iodophenyl)-2-hydroxyethyl)carbamate (4.8112 g, 12.62 mmol) was dissolved in DCM (100 mL) and cooled to 0° C. Et3N (2.62 mL, 18.93 mmol) was added next and then MsCl (1.180 mL, 15.15 mmol) was added dropwise. The reaction mixture was agitated at same temperature for 30 min after which RM quenched with Sat′d NaHCO3 and water. The product was extracted with DCM and the combined organic layer was dried (magnesium sulfate), filtered and concentrated in vacuo to afford the crude product which was dissolved in DMF (25 mL, ca 0.5 M). NaN3 (2.462 g, 37.9 mmol) was added next and the mixture heated at 70° C. After 6 h, the reaction mixture was cooled to room temperature and diluted with EtOAc and water and the product extracted with EtOAc. The combined organic extract was washed with water thrice and dried (magnesium sulfate), filtered and concentrated in vacuo and the residue purified by flash chromatography (0-50%) EtOAc/heptane to afford 4.03 g of (S)-tert-butyl (2-azido-1-(3-fluoro-5-iodophenyl)ethyl)carbamate as desired product. LCMS (m/z): 351.0 (MH+-56), 1.05 min.

1. customquenched with Sat′d NaHCO3 and water
2. extractionThe product was extracted with DCM
3. dry with materialthe combined organic layer was dried (magnesium sulfate)
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto afford the crude product which
7. temperaturethe mixture heated at 70° C
8. waitAfter 6 h
9. temperaturethe reaction mixture was cooled to room temperature
10. extractionthe product extracted with EtOAc
11. extractionThe combined organic extract
12. washwas washed with water thrice
13. dry with materialdried (magnesium sulfate)
14. filtrationfiltered
15. concentrationconcentrated in vacuo
16. customthe residue purified by flash chromatography (0-50%) EtOAc/heptane