反应详情

Ethyl 4-(3,5-bis(trifluoromethyl)benzyloxy)-3-phenylbutanoate (26.06 g, 60 mmol) was dissolved in ethanol (300 mL), a 2 mol/L aqueous solution of sodium hydroxide was added thereto and the mixture was stirred for 20 hours at room temperature. The solvent was evaporated in vacuo and the resulting residue was dissolved in water and acidified with 6 mol/L hydrochloric acid. The oily product separated out therefrom was extracted with chloroform and the organic layers were combined and washed with water and a saturated saline solution. After it was dried over anhydrous sodium sulfate, the solvent was evaporated in vacuo to give 4-(3,5-bis(trifluoromethyl)benzyloxy)-3-phenylbutanoic acid (26.60 g, 90%) as an oily product. 1H-NMR (DMSO-d6) δ: 2.56 (dd, J=8.4, 16.0 Hz, 1H), 2.73 (dd, J=6.4, 16.0 Hz, 1H), 3.35-3.40 (m, 1H), 3.63-3.66 (m, 2H), 4.64 and 4.66 (ABq, J=13.4 Hz, 2H), 7.19-7.25 (m, 1H), 7.27-7.31 (m, 4H), 7.88 (s, 2H), 7.98 (s, 1H), 12.09 (brs, 1H).

1. customThe solvent was evaporated in vacuo
2. dissolutionthe resulting residue was dissolved in water
3. customThe oily product separated out
4. extractiontherefrom was extracted with chloroform
5. washwashed with water
6. dry with materialAfter it was dried over anhydrous sodium sulfate
7. customthe solvent was evaporated in vacuo