反应详情

Lithium hydroxide hydrate (0.12 g; 2.82 mmole) dissolved in water (10 ml) was slowly added to a solution of 2-ethoxy-3-[4-(2-{4-methanesulfonyloxyphenyl}ethoxy)phenyl]propanoic acid ethyl ester (described in Example 1d) (1.12 g; 2.56 mmole) in tetrahydrofuran (30 ml). After stirring at room temperature for 3 hours. Water (50 ml) was added and tetrahydrofuran was removed by evaporation in vacuo. The residue was acidified with hydrochloric acid (2M), and extracted three times with ethyl acetate. The combined organic phases were dried with magnesiumsulfate. Evaporation of the solvent gave 1 g (yield 96%) of 2-ethoxy-3-[4-(2-{4-methanesulfonyloxyphenyl}ethoxy)phenyl]propanoic acid.

1. customtetrahydrofuran was removed by evaporation in vacuo
2. extractionextracted three times with ethyl acetate
3. dry with materialThe combined organic phases were dried with magnesiumsulfate
4. customEvaporation of the solvent