反应详情

To a solution of the 2-[6-chloro-5-(2,2,2-trifluoro-ethoxy)-4′-trifluoromethyl-biphenyl-3-yl]-3-cyclobutyl-propionic acid methyl ester (8.0 g, 14.5 mmol) in a mixture of the EtOH (100 mL) and H2O (15 mL) was added potassium hydroxide (10 g, 178.5 mmol). The reaction mixture was refluxed for 3 h and the solvent evaporated. Then, 6 N HCl was added to adjust the pH to 3-5 and the mixture was extracted with EtOAc (3×50 mL). The combined organic phases were dried over MgSO4 and evaporated to give 2-[6-chloro-5-(2,2,2-trifluoro-ethoxy)-4′-trifluoromethyl-biphenyl-3-yl]-3-cyclobutyl-propionic acid as a white solid (7.0 g, 90%). 1H NMR (300 MHz, CDCl3/TMS): δ 7.70 (d, J=8.2 Hz, 2H), 7.53 (d, J=8.2 Hz, 2H), 6.98 (s, 2H), 4.47 (q, J=8.0 Hz, 2H), 3.49 (t, J=7.7 Hz, 1H), 2.27-2.13 (m, 2H), 2.06-1.73 (m, 5H), 1.71-1.52 (m, 2H). 13C NMR (75 MHz, CDCl3/TMS): δ 179.1, 153.6, 142.1, 141.2, 138.0, 129.7, 125.0 (q, 3JCF=3.6 Hz), 124.9, 124.0 (q, 1JCF=262.5 Hz), 123.0 (q, 1JCF=277.6 Hz), 121.8, 114.3, 67.3 (q, 1JCF=36.0 Hz), 49.3, 40.3, 33.9, 28.3, 28.0, 18.5.

1. temperatureThe reaction mixture was refluxed for 3 h
2. customthe solvent evaporated
3. additionThen, 6 N HCl was added
4. extractionthe mixture was extracted with EtOAc (3×50 mL)
5. dry with materialThe combined organic phases were dried over MgSO4
6. customevaporated