反应详情

To a solution of 4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-2-trifluoromethyl-benzoic acid methyl ester (Example I13) (4.3 g) in tetrahydrofuran (3 ml) and methanol (3 ml) was added a solution of potassium hydroxide (1.0 g) in water (4.0 ml). The reaction mixture was stirred at ambient temperature for 2 hours. The reaction mixture was acidified by addition of hydrochloric acid (2M) (200 ml) and the mixture extracted with ethyl acetate (3×100 ml). The combined organic extracts were washed with brine, dried over sodium sulfate and concentrated. The residue was re-crystallized from dichloromethane and heptane to give 4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-2-trifluoromethyl-benzoic acid (3.58 g) as a white powder. 1H-NMR (CDCl3, 400 MHz): 8.08-7.45 (m, 6H), 4.14 (d, 1H), 3.76 (d, 1H).

1. extractionthe mixture extracted with ethyl acetate (3×100 ml)
2. washThe combined organic extracts were washed with brine
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated
5. customThe residue was re-crystallized from dichloromethane and heptane