Potassium tert-butoxide → 4-tert-butoxy-2,5-difluoro-N-(methylsulfonyl)benzamide

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To a solution of 2,4,5-trifluoro-N-(methylsulfonyl)benzamide (Preparation 16, 1.50 g, 5.92 mmol) in DMSO (10 mL) at room temperature was added potassium t-butoxide (1.46 g, 13.0 mmol). After 18 hours the reaction mixture was diluted with EtOAc (30 mL) and 10% aqueous citric acid solution (15 mL). The pH of the aqueous layer was checked to ensure it was acidic. The organic layer was separated and washed with 10% aqueous citric acid solution (15 mL) and brine (15 mL), dried over magnesium sulphate, filtered and evaporated to yield the title compound as a cream solid (1.76 g, 97%).

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