反应详情

(S)-2-Ethoxy-3-(4-[2-{4-(methoxycarbonylamino)phenyl]ethoxy]phenyl)propanoic acid ethyl ester (described in Example 41) (0.52 g; 1.25 mmole) was dissolved in tetrahydrofuran (10 ml) and lithium hydroxide (0.034 g; 1.42 mmole) dissolved in water (2 ml) was added slowly. The reaction mixture was stirred over night, hydrochloric acid (1 M, 1 ml) was added and tetrahydrofuran evaporated. The residue was extracted three times with ethyl acetate. The organic phase was dried with magnesium sulfate and evaporated and 0.47 g (99% yield) (S)-2-ethoxy-3-[4-{2-[4-(methoxycarbonylamino)phenyl)ethoxy]phenyl}propanoic acid was obtained.

1. additionwas added slowly
2. customtetrahydrofuran evaporated
3. extractionThe residue was extracted three times with ethyl acetate
4. dry with materialThe organic phase was dried with magnesium sulfate
5. customevaporated