Oxalic Acid → (2R)-1-(3'-(Methoxycarbonyl)biphenyl-4-yloxy)-4-(3-pyridyl)-2-butanol oxalic acid salt

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Reaction Steps

Concentrated sulfuric acid (2.5 ml) was added to a suspension of (2R)-1-(3'-carboxybiphenyl-4-yloxy)-4-(3-pyridyl)-2-butanol (0.5 g) in methanol (50 ml). The mixture was heated at reflux for 10 hours. The mixture was cooled to room temperature and made basic by addition of aqueous sodium hydrogen carbonate. The mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by column chromatography over silica eluting with dichloromethane:methanol (19:1) to give an oil which was converted to the oxalate salt upon treatment with oxalic acid (excess) in ether to give the title compound as a solid (0.482 g).

Provenance & Evidence