1-Bromo-2-methylpropane → 4-{[(3,5-dimethyl-4-isoxazolyl)methyl]oxy}-N-(3,5-dimethyl-2-pyridinyl)-N-(2-methylpropyl)benzenesulfonamide

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To a solution of 4-{[(3,5-dimethyl-4-isoxazolyl)methyl]oxy}-N-(3,5-dimethyl-2-pyridinyl)benzenesulfonamide (56 mg, 0.145 mmol) in acetonitrile (1 mL) was added N″-(1,1-dimethylethyl)-N,N,N′,N′-tetramethylguanidine (25 mg, 0.145 mmol) and the mixture was stirred at room temperature for 1 hour, 1-bromo-2-methylpropane (0.031 mL, 0.289 mmol) was then added and the mixture was stirred at 70° C. for 125 hours. The mixture was concentrated in vacuo and partitioned between dichloromethane (5 mL) and water (5 mL). The organic layer was then purified by mass directed autoprep (formic acid modifier) to give the title compound (30 mg) as a white solid. LCMS (2 min, formic) Rt 1.31 min, m/z (ES+) 444 (M+H).

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