Methanesulfonamide → 4-(4-Chlorophenoxy)-2-fluoro-5-(2-methoxypyridin-3-yl)-N-(methylsulfonyl)benzamide

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Reaction Steps

To a mixture of 4-(4-chlorophenoxy)-2-fluoro-5-(2-methoxypyridin-3-yl)benzoic acid (Preparation 30, 236 mg, 0.63 mmol), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (462 mg, 1.21 mmol), N,N-diisopropylethylamine (838 μL, 4.81 mmol) in dichloromethane (40 mL) and dimethylformamide (5.4 mL) which had been stirred at room temperature for 10 minutes was added methyl sulfonamide (151 mg, 1.59 mmol). The reaction was heated at 45° C. for 18 hours under a nitrogen atmosphere. The mixture was cooled to room temperature and concentrated in vacuo to afford a brown residue. The brown residue was partitioned between aqueous hydrochloric acid (0.5 M, 40 mL) and dichloromethane (100 mL). The organic extract was washed with aqueous hydrochloric acid (0.5 M, 2×40 mL), dried over sodium sulfate, filtered and concentrated in vacuo to afford a brown oil (335 mg). The product was purified by flash column chromatography eluting with dichloromethane/methanol (100% to 97%) to afford a yellow gum (91.0 mg). A portion of this material (50 mg) was purified by A-HPLC to afford the title compound as an off-white solid (35.8 mg, 13%):

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