反应详情

Aqueous sodium hydroxide (4M, 3 mL, 12 mmol) was added to a solution of (RS)-methyl α-methyl-3,5-bis(trifluoromethyl)benzeneacetate (Description 3, 0.96 g, 3.2 mmol) in methanol (5 mL) and the mixture was heated under reflux for 1 hour. The mixture was cooled and the solvent was evaporated under reduced pressure. The residue was diluted with water, acidified with hydrochloric acid (2M) and extracted with ethyl acetate (2×25 mL). The combined organic fractions were washed with brine, dried (MgSO4) and the solvent was evaporated under reduced pressure to give the title compound as a colorless solid (0.92 g, 99%). 1H NMR (360 MHz, CDCl3) δ 1.60 (3H, d, J 7.2 Hz), 3.90 (1H, q, J 7.2 Hz), 7.78 (2H, s) and 7.81 (1H, s).

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1 hour
3. temperatureThe mixture was cooled
4. customthe solvent was evaporated under reduced pressure
5. additionThe residue was diluted with water
6. extractionextracted with ethyl acetate (2×25 mL)
7. washThe combined organic fractions were washed with brine
8. dry with materialdried (MgSO4)
9. customthe solvent was evaporated under reduced pressure