反应详情

A mixture of 0.589 g (1.4 mmol) of 4,4,4-trifluoro-3-[(R)-2-(3-trifluoromethyl-phenyl)-morpholin-4-ylmethyl]-butyric acid ethyl ester, ca. 1.07 mL of 2 M sodium hydroxide solution and 14 mL of ethanol was heated at reflux and stirred under an atmosphere of argon. After 25 min, volatiles were removed under reduced pressure. The mixture was treated with 40 mL of saturated sodium dihydrogen phosphate solution, and extracted twice with ethyl acetate. The combined ethyl acetate layers were washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 0.543 g (99%) of 4,4,4-trifluoro-3-[(R)-2-(3-trifluoromethylphenyl)-morpholin-4-ylmethyl]-butyric acid as a glass. 1H NMR (400 MHz, DMSO-d6) δ ppm 2.10-2.21 (m, 1H) 2.31-2.66 (m, 3H overlapping DMSO) 2.79 (dd, J=16.81, 11.54 Hz, 1H) 2.95-3.21 (m, 2H) 3.34 (s, 2H) 3.65 (dtd, J=18.23, 11.34, 11.34, 2.26 Hz, 1H) 3.91-4.02 (m, 1H) 4.45-4.64 (m, 1H) 7.53-7.75 (m, 4H) 12.49 (br. s., 1H).

1. temperaturewas heated
2. temperatureat reflux
3. customvolatiles were removed under reduced pressure
4. additionThe mixture was treated with 40 mL of saturated sodium dihydrogen phosphate solution
5. extractionextracted twice with ethyl acetate
6. washThe combined ethyl acetate layers were washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure