Citric Acid → 4-[3-(4-Chlorophenylsulfonyl)propyl]-2-[3-[2-(4-phenyl-2-thiazolyl)vinyl]benzoylamino]phenoxyacetic acid

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Reaction Steps

Ethyl 4-[3-(4-chlorophenylsulfonyl)propyl]-2-[3-[2-(4-phenyl-2-thiazolyl)vinyl]benzoylamino]phenoxyacetate (0.30 g, 0.43 mmol) was dissolved in a mixed solution of tetrahydrofuran (10 ml) and methanol (5 ml), 1 N sodium hydroxide aqueous solution (1.0 ml) was added to the solution, and the mixture was subjected to 12 hours of reaction. The reaction solution was acidified by adding ice and 10% citric acid aqueous solution, and the product formed was extracted three times with chloroform. The resulting organic layer was washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. By crystallizing the resulting residue from chloroform-acetonitrile, 4-[3-(4-chlorophenylsulfonyl)propyl]-2-[3-[2-(4-phenyl-2-thiazolyl)vinyl]benzoylamino]phenoxyacetic acid (0.24 g, 0.36 mmol, 83%) was obtained as colorless crystals.

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