反应详情

A mixture of bromoamide ((2R)-3-bromo-N-[4-cyano-3-(trifluoromethyl)phenyl]-2-hydroxy-2-methylpropanamide (2.0 g, 5.70 mmol), 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, was heated to reflux for 3 h, and then concentrated under reduced pressure to give a solid. The residue 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. 1H NMR (CDCl3/TMS) δ 1.63 (s, 3H, CH3), 3.34 (bs, 1H2OH), 4.08 (d, J=9.17 Hz, 1H, CH), 4.50 (d, J=9.17 Hz, 1H, CH), 6.74-6.82 (m, 2H, ArH), 7.50-7.55 (m, 1H, ArH), 7.81 (d, J=8.50 Hz, 1H, ArH), 7.97 (q, J=2.03, 8.50 Hz, 1H, ArH), 8.11 (d, J=2.03 Hz, 1H, ArH), 9.12 (s, 1H, NH). Calculated Mass: 407.1, [M+Na]+430.0. Mp: 124-125° C.

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