Citric Acid → HCID 68430400, compound

Participants

Reaction Steps

To a mixed solution of methyl(4-((2-phenoxybenzyl)oxy)phenyl)acetate (150 mg) in methanol (2.5 ml) and tetrahydrofuran (1.5 ml), 0.43 ml of 5N aqueous sodium hydroxide was added, and the reaction solution was stirred at room temperature for 1 hour. To the reaction solution was added 10% aqueous citric acid, and the mixture was extracted with chloroform. The combined organic layers were washed with a saturated saline solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to afford a crude product as a colorless oil. To a solution of the crude product in chloroform (2 ml), 64 mg of Meldrum's acid, 84 mg of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, and 110 mg of 4-dimethylaminopyridine were added, and the reaction solution was stirred overnight at room temperature. The reaction solution was diluted with chloroform and water, washed with 5% aqueous citric acid and a saturated saline solution sequentially, and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue obtained was purified by silica gel column chromatography (eluent: chloroform/methanol (98:2)) to afford a colorless oil. To a solution of the resultant oil (100 mg) in toluene (2 ml) was added 0.12 ml of ethanol, and the reaction solution was heated to reflux for 5 hours. The reaction solvent was distilled off under reduced pressure, and the residue obtained was purified by silica gel column chromatography (eluent: hexane/ethyl acetate (90:10-70:30)) to afford the title compound as a colorless oil.

Provenance & Evidence