m-Chloroperbenzoic acid → [5-Methoxy-2-methyl-4-(4'-trifluoromethyl-biphenyl-4-ylmethanesulfonyl)-phenoxy]-acetic acid

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Preparation of [5-Methoxy-2-methyl-4-(4′-trifluoromethyl-biphenyl-4-ylmethanesulfonyl)-phenoxy]-acetic acid methyl ester (compound 50A) Example 4 (200 mg) was dissolved in 5 ml dichloromethane. Excess m-chloroperbenzoic acid (300 mg) was added and the reaction was allowed to stir 3 h. The solvent was removed under vacuum and the crude product was purified by MPLC. MS m/z 509 (M+1). Step 2. Preparation of [5-Methoxy-2-methyl-4-(4′-trifluoromethyl-biphenyl-4-ylmethanesulfonyl)-phenoxy]-acetic acid (compound 50) The title compound was prepared in the manner analogous to Example 1 using 50A. 400 MHz 1H NMR (DMSO-d6) δ 13.13 (br(s), 1H), 7.85 (d, 2H, J=8.1 Hz), 7.77 (d, 2H, J=8.3 Hz), 7.66 (d, 2H, J=8.6 Hz), 7.3 (m, 3H), 6.76 (s, 1H), 4.89 (s, 2H), 4.67 (s, 2H), 3.96 (s, 3H), 2.04 (s, 3H). MS m/z 495 (M+1).

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