Hydrochloric Acid → 5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-alpha-ethyl-1,2-benzisothiazole-3-acetonitrile

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Reaction Steps

To a solution of 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-acetonitrile (0.730 g, 0.00199 mol) in dimethyl sulfoxide is added iodoethane (0.170 ml, 0.00210 mol) followed by potassium carbonate (0.750 g, 0.00543 mol). The resultant mixture is stirred overnight at room temperature and poured onto a mixture of ice and 5% aqueous hydrochloric acid. The resultant solid is filtered, dried and taken up in a minimal amount of methylene chloride. Flash column chromatography using silica gel and 100% to 99:1 methylene chloride/diethyl ether gives the title compound as a white solid (0.220 g, 28.0%, mp 107-109° C.) which is identified by NMR spectral analysis.

Provenance & Evidence