反应详情

2-Ethoxy-3-{4-[2-(4-methanesulfonylaminophenyl)ethoxy]phenyl}propanoic acid ethyl ester (described in Example 62) (0.554 g; 1.27 mmole) was dissolved in tetrahydrofuran (5.7 ml). Lithium hydroxide hydrate (0.137 g; 3,26 mmole) was dissolved in water and added in portions during 30 minutes at room temperature. The reaction mixture was kept in the refrigerator over night. Tetrahydrofuran was evaporated in vacuo. The water residue was washed with ethyl acetate, acidified with hydrochloric acid (1M) to pH 1-2 and the mixture was extracted with ethyl acetate. The organic phase was washed with brine, dried (sodium sulfate), filtered and the solvent was evaporated in vacuo to give 0.54 g (yield 100%) of 2-ethoxy-3-{4-[2-(4-methanesulfonylaminophenyl)ethoxy]phenyl}propanoic acid.

1. additionadded in portions during 30 minutes at room temperature
2. waitThe reaction mixture was kept in the refrigerator over night
3. customTetrahydrofuran was evaporated in vacuo
4. washThe water residue was washed with ethyl acetate
5. extractionthe mixture was extracted with ethyl acetate
6. washThe organic phase was washed with brine
7. dry with materialdried (sodium sulfate)
8. filtrationfiltered
9. customthe solvent was evaporated in vacuo