Citric Acid → 5-[(2-{[(3,5-Bis-trifluoromethyl-benzyl)-(5-morpholin-4-yl-pyrimidin-2-yl)-amino]-methyl}-4-trifluoromethyl-phenyl)-ethoxycarbonyl-amino]-pentanoic acid

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Ethyl 5-[(2-{[(3,5-bis-trifluoromethyl-benzyl)-(5-morpholin-4-yl-pyrimidin-2-yl)-amino]-methyl}-4-trifluoromethyl-phenyl)-ethoxycarbonyl-amino]-pentanoate (134 mg) is dissolved in methanol (1 ml), and thereto is added 1M-aqueous sodium hydroxide solution (1 ml), and the mixture is stirred at room temperature for 1 hour and a half. The reaction solution is made weakly acidic with a 10% aqueous citric acid solution, and the mixture is extracted with ethyl acetate, 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 (chloroform:methanol=19:1) to give 5-[(2-{[(3,5-bis-trifluoromethyl-benzyl)-(5-morpholin-4-yl-pyrimidin-2-yl)-amino]-methyl}-4-trifluoromethyl-phenyl)-ethoxycarbonyl-amino]-pentanoic acid (123 mg). MS (m/z): 752 [M+H]+

Provenance & Evidence