反应详情

A mixture of bromoamide ((2R)-3-bromo-N-[4-cyano-3-(trifluoromethyl)phenyl]-2-hydroxy-2-methylpropanamide, R-19 (2.0 g, 5.70 mmol) and anhydrous K2CO3 (2.4 g, 17.1 mmol) in 50 mL of acetone was heated to reflux for 2 h and then concentrated under reduced pressure to give a solid. The resulting solid was treated with 2-fluoro-4-hydroxybenzonitrile (1.2 g, 8.5 mmol) and anhydrous K2CO3 (1.6 g, 11.4 mmol) in 50 mL of 2-propanol and was heated to reflux for 3 h, then concentrated under reduced pressure to give a solid. The residue was was treated with 100 mL of H2O and then extracted with EtOAc (2×100 mL). The combined EtOAc extracts were washed with 10% NaOH (4×100 mL) and brine, successively. The organic layer was dried over MgSO4 and then concentrated under reduced pressure to give an oil which was crystallized from CH2Cl2/hexane to give 0.5 g (23%) of (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyano-3-fluorophenoxy)-2-hydroxy-2-methylpropanamide as a colorless solid.

1. temperatureto reflux for 2 h
2. concentrationconcentrated under reduced pressure
3. customto give a solid
4. temperaturewas heated
5. temperatureto reflux for 3 h
6. concentrationconcentrated under reduced pressure
7. customto give a solid
8. extractionextracted with EtOAc (2×100 mL)
9. washThe combined EtOAc extracts were washed with 10% NaOH (4×100 mL) and brine
10. dry with materialThe organic layer was dried over MgSO4
11. concentrationconcentrated under reduced pressure
12. customto give an oil which
13. customwas crystallized from CH2Cl2/hexane