Methyl iodide → {{5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazol-3-yl}oxy}acetonitrile

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Reaction Steps

A mixture of {{5-[3,6-dihydro-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazol-3-yl}oxy}acetonitrile (2.63 g, 7.15 mmol) and potassium carbonate (1.97 g, 14.3 mmol) in N,N-dimethylformamide is stirred for 30 minutes, treated with iodomethane (2.03 g, 14.3 mmol), stirred overnight at room temperature, and poured into an ice-water mixture. The resultant aqueous mixture is filtered to obtain a solid. The solid is dissolved in ethyl acetate and the resultant solution is washed sequentially with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to obtain a brown solid. Column chromatography of the solid using silica gel and methylene chloride affords a yellow solid. The yellow solid is recrystallized from a methylene chloride/hexanes solution to give the title product as an off-white solid, mp 265-266° C.

Provenance & Evidence