反应详情

3-[4-(2-{4-tert-Butoxycarbonylaminophenyl}ethoxy)phenyl]-2-(2,2,2-tnifluoroethoxy)propanoic acid methyl ester (described in Example 60)(0.27 g; 0.52 mmole) was dissolved in tetrahydrofuran and water (2:1), lithium hydroxide (0.015 g; 0.62 mmole) was added and the reaction mixture was stirred over night. Water was added and tetrahydrofuran was evaporated. The remaining water residue was extracted once with diethyl ether, acidified with diluted hydrochloric acid and extracted with ethyl acetate. The organic phase was dried with magnesium sulfate. Evaporation gave 0.22 g (85% yield) of 3-[4-(2-{4-tert-butoxycarbonylaminophenyl}ethoxy)phenyl]-2-(2,2,2-trifluoroethoxy)propanoic acid.

1. customtetrahydrofuran was evaporated
2. extractionThe remaining water residue was extracted once with diethyl ether
3. extractionextracted with ethyl acetate
4. dry with materialThe organic phase was dried with magnesium sulfate
5. customEvaporation