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温度

0 °C

Methyl 4-(5-(2,2,2-trifluoroacetyl)thiophen-2-yl)butanoate (250 mg, 0.89 mmol) was dissolved in THF-H2O (15 MI, 2:1 v/v) and cooled to 0° C. LiOH.H2O (35 mg, 0.89 mmol) was added and the reaction mixture was allowed to warm up to room temperature and stirred for 1.5 h. Solvent was removed under reduced pressure and the aqueous layer was washed with EtOAc. The Ph of the aqueous layer was adjusted to 2-3 using 1.5N HCl. The product was extracted with EtOAc. The combined extracts were dried over anhydrous sodium sulfate and concentrated under reduced pressure to get 4-(5-(2,2,2-trifluoroacetyl)thiophen-2-yl)butanoic acid (220 mg, crude), which was carried through without further purification. 1H NMR (300 MHz, DMSO-d6) δ 12.13 (br s, 1H), 8.00-7.98 (m, 1H), 7.21-7.19 (d, J=3.9 Hz, 1H), 2.98-2.93 (t, J=7.7 Hz, 2H), 2.31-2.26 (m, 2H), 1.93-1.83 (m, 2H). MS (ESI) m/z: Calculated for C10H9F3O3S: 266.02. found: 264.8 (M−H)−

1. temperatureto warm up to room temperature
2. customSolvent was removed under reduced pressure
3. washthe aqueous layer was washed with EtOAc
4. extractionThe product was extracted with EtOAc
5. dry with materialThe combined extracts were dried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure