1-Bromo-2-methylpropane → 4-{[(3,5-dimethyl-4-isoxazolyl)methyl]oxy}-N-(4,6-dimethyl-3-pyridinyl)-N-(2-methylpropyl)benzenesulfonamide

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4-{[(3,5-dimethyl-4-isoxazolyl)methyl]oxy}-N-(4,6-dimethyl-3-pyridinyl)benzenesulfonamide (100 mg, 0.258 mmol) and 2-(tert-butyl)-1,1,3,3-tetramethylguanidine (44.2 mg, 0.258 mmol) were dissolved in acetonitrile (1 mL). The mixture was stirred at room temperature for 1 hour, then 1-bromo-2-methylpropane (0.028 mL, 0.258 mmol) was added. The reaction was stirred at room temperature for 20 hours, then additional 2-(tert-butyl)-1,1,3,3-tetramethylguanidine (44.2 mg, 0.258 mmol) and 1-bromo-2-methylpropane (0.028 mL, 0.258 mmol) were added. The reaction was heated to 60° C. and stirred for a further 2 hours. The solvent was removed in vacuo and the residue was partitioned between water (5 mL) and dichloromethane (5 mL). The organic layer was separated, concentrated and purified by mass directed autoprep (formic acid modifier). The required fractions were combined and concentrated to provide the title compound (17 mg) as a colourless oil. LCMS (2 min, formic) Rt 1.04 mins, m/z (ES+) 444 (M+H).

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