Potassium Carbonate → 4-[2-Oxazol-2-yl-5-(thiophen-3-ylmethoxy)-phenoxy]-4-o-tolyl-butyric acid

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A solution of ethyl (RS)-4-[2-(oxazol-2-yl)-5-(3-thienylmethoxy)phenoxy]-4-(2-methylphenyl)butanoate (140 mg) in methanol (25 mL) containing 10% w/v potassium carbonate (2 mL) is stirred at reflux for 2 hours. The reaction mixture is partitioned between 1 N HCl (50 mL) and ethyl acetate (50 mL) then the organic phase is washed with water (2×50 mL), dried over magnesium sulphate, filtered and concentrated under reduced pressure. Recrystallisation from cyclohexane/ethyl acetate gives (RS)-4-[2-(oxazol-2-yl)-5-(3-thienylmethoxy)phenoxy]-4-(2-methylphenyl)butanoic acid as a white solid (70 mg), m.p. 112-114° C. [Elemental analysis:- C,66.8, H, 5.16, N, 3.12%. Calculated:- C,66.5, H, 5.04, N, 3.01%]

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