Hydrochloric Acid → 3-{[4-(4-Acetyl-3-hydroxy-2-methyl-phenoxymethyl)-phenyl]-fluoro-methyl}-benzoic acid

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A suspension of 3-{[4-(4-acetyl-3-hydroxy-2-methyl-phenoxymethyl)-phenyl]-hydroxy-methyl}-benzoic acid (100 mg, 0.246 mmol) and dichloromethane (5 mL) is stirred at −78° C. Dimethylamino sulfur trifluoride (35 μL, 0.271 mmol) is added and the mixture is warmed to room temperature. An additional portion of dimethylamino sulfur trifluoride (35 μL, 0.271 mmol) is added and suspension becomes a solution. The reaction mixture is diluted with aqueous 2N sodium hydroxide (5 mL) and tetrahydrofuran (2 mL) and stirred 10 min. The pH is adjusted to 2 with aqueous 5N hydrochloric acid and extracted with ethyl acetate (2×20 mL). The combined extracts are concentrated and the resulting residue is purified via silica chromatography eluting with hexanes to 1:1 hexanes:ethyl acetate to give the title compound (70 mg, 70%) as a white solid. 1H NMR (DMSO-d6) δ 13.12 (s, 1H), 12.86 (s, 1H), 7.93-7.95 (m, 2H), 7.82 (d, 1H), 7.68 (d, 1H), 7.44-7.59 (m, 5H), 6.75-6.90 (d, 1H), 6.72 (d, 1H), 5.29 (s, 2H), 2.59 (s, 3H), 2.06 (s, 3H). LCMS M−1 407.

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