Dimethyl Sulfate → 5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-N-methyl-N-(methylsulfonyl)-1,2-benzisothiazole-3-carboxamide

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To a solution of 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-N-(methylsulfonyl)-1,2-benzisothiazole-3-carboxamide (0.300 g, 0.000670 mol) in acetone is added dimethyl sulfate (0.180 g, 0.00140 mol) followed by potassium carbonate (0.250 g, 0.00180 mol). The resultant mixture is stirred one hour at reflux and concentrated in vacuo. The residue is partitioned between methylene chloride and water. The organic layer is saved and the aqueous layer is extracted with methylene chloride. The combined organic layers are washed with water, dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo. The residue is chromatographed on silica gel with ethyl acetate:hexanes to give the title compound as a white solid (0.232 g, 74.9%, mp 120-122° C.).

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