1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 2-(2-{3-Dimethylcarbamoyl-4-[(4'-trifluoromethylbiphenyl-2-carbonyl)amino]phenoxy}acetoxymethyl)-2-phenylmalonic acid diethyl ester

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4-Dimethylaminopyridine (53 mg), 2-hydroxymethyl-2-phenylmalonic acid diethyl ester (116 mg) and {3-dimethylcarbamoyl-4-[(4′-trifluoromethylbiphenyl-2-carbonyl)amino]phenoxy}acetic acid (176 mg) were dissolved in acetone (5 mL), and to the solution was added WSC (104 mg). The mixture was stirred at room temperature for 3 hours and then concentrated. The residue was purified by column chromatography on silica gel (ethyl acetate:hexane=1:1) to give 2-(2-{3-dimethylcarbamoyl-4-[(4′-trifluoromethylbiphenyl-2-carbonyl)amino]phenoxy}acetoxymethyl)-2-phenylmalonic acid diethyl ester (133 mg) as a colorless solid (m.p. 132-138° C.).

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