反应详情

Ethyl 4-{5-[(3,5-bis-trifluoromethyl-benzyl)-(5′-isopropyl-2′-methoxy-4-trifluoromethyl-biphenyl-2-ylmethyl)-amino]-tetrazol-2-yl}-butyrate (180 mg) is dissolved in ethanol (3 ml), and thereto is added a 2M-aqueous sodium hydroxide solution (0.5 mL) and the mixture is stirred at room temperature for 1 hour and a half. The reaction mixture is made acidic with a 1N-hydrochloric acid and extracted with ethyl acetate. The organic layer is washed with a saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting residue is purified by silica gel column chromatography (chloroform:methanol=20:1) to give 4-{5-[(3,5-bis-trifluoromethyl-benzyl)-(5′-isopropyl-2′-methoxy-4-trifluoromethyl-biphenyl-2-ylmethyl)-amino]-tetrazol-2-yl}-butyric acid (160 mg). MS (m/z): 704 [M+H]+

1. extractionextracted with ethyl acetate
2. washThe organic layer is washed with a saturated brine
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe resulting residue is purified by silica gel column chromatography (chloroform:methanol=20:1)