1-Bromo-2-methylpropane → 4-((3,5-dimethylisoxazol-4-yl)methoxy)-N-isobutyl-N-(5-methylpyridin-2-yl)benzenesulfonamide

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To a solution of 4-((3,5-dimethylisoxazol-4-yl)methoxy)-N-(5-methylpyridin-2-yl)benzenesulfonamide (187 mg, 0.5 mmol) in acetonitrile (5 mL) stirred at room temperature, was added 2-(tert-butyl)-1,1,3,3-tetramethylguanidine (0.261 mL, 1.250 mmol). The mixture was stirred at room temperature for 1 hour, then 1-bromo-2-methylpropane (0.190 mL, 1.750 mmol) added. The reaction was then heated by microwaves to 160° C., for 25 minutes. After cooling, dicholormethane (5 mL) was added to the mixture and the organic phase washed with water (5 mL) then separated using a hydrophobic frit. The solvent was removed under a stream of nitrogen and the crude sample purified by mass directed autoprep (ammonium carbonate modifier) to give the title product (8.5 mg). LCMS (3 min, High pH) Rt 1.88 min, m/z (ES+) 430 (M+H).

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