反应详情

2-[(4-{2-[(4′-Fluorobiphenyl-4-yl)methoxy]ethyl}-1,3-thiazol-2-yl)thio]-2-methylpropionic acid ethyl ester (400 mg) synthesized in Example 155-3 was dissolved in methanol (4 mL) and tetrahydrofuran (4 mL), aqueous sodium hydroxide solution (1 mol/L, 2 mL) was added, and the mixture was stirred at room temperature for 4 hr. The reaction mixture was concentrated under reduced pressure, aqueous 10% citric acid solution was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=3:1 to 1:1) to give the title compound (245 mg) as a white solid.

1. concentrationThe reaction mixture was concentrated under reduced pressure, aqueous 10% citric acid solution
2. additionwas added
3. extractionthe mixture was extracted with ethyl acetate
4. washThe organic layer was washed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. customThe solvent was evaporated under reduced pressure
7. customthe residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=3:1 to 1:1)