Ethyl Acetate → 4-(2-{(3,5-Bis-trifluoromethyl-benzyl)-[2-(butyl-ethyl-amino)-5-trifluoromethyl-benzyl]-amino}-pyrimidin-5-yloxy)-butyric acid

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Reaction Steps

Ethyl 4-(2-{(3,5-bis-trifluoromethyl-benzyl)-[2-(butyl-ethyl-amino)-5-trifluoromethyl-benzyl]-amino}-pyrimidin-5-yloxy)-butyrate (110 mg) is dissolved in ethanol (2 ml) and thereto is added a 2N-aqueous sodium hydroxide solution (233 μl) and the mixture is stirred at room temperature overnight. Thereto are added ethyl acetate and a saturated aqueous citric acid solution, and the mixture is separated and 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 (hexane:ethyl acetate=9:1 to 7:3) to give 4-(2-{(3,5-bis-trifluoromethyl-benzyl)-[2-(butyl-ethyl-amino)-5-trifluoromethyl-benzyl]-amino}-pyrimidin-5-yloxy)-butyric acid (69 mg). The resulting carboxylic acid is dissolved in ethanol (0.2 mL) and thereto is added 2N-aqueous sodium hydroxide solution (50 μl) and the reaction solution is concentrated under reduced pressure to give 4-(2-{(3,5-bis-trifluoromethyl-benzyl)-[2-(butyl-ethyl-amino)-5-trifluoromethyl-benzyl]-amino}-pyrimidin-5-yloxy)-butyric acid sodium salt (70 mg). MS (m/z): 679 [M−Na]−

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