Methyl iodide → Ethyl 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-acetate

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A mixture of ethyl 5-[3,6-dihydro-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-acetate (0.643 g, 0.00160 mol) and potassium carbonate (0.243 g, 0.00170 mol) in N,N-dimethylformamide is stirred at room temperature for 90 minutes, treated with iodomethane (0.320 mL, 0.00500 mol), stirred at room temperature overnight, and diluted with water. The resultant aqueous mixture is extracted with methylene chloride. The organic extract is washed with water, dried over anhydrous magnesium sulfate, and concentrated in vacuo to obtain a brown oil. Column chromatography of the oil using silica gel and a 10% ethyl acetate in hexanes solution gives the title product as a tan solid (0.362 g, mp 150-152° C.).

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