Potassium Carbonate → 2-[6-carboxybenzothiazol-2(3H)-ylidene]-2-(4-trifluoromethyl-pyrimidin-2-yl)acetonitrile

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A mixture of 4-amino-3-mercaptobenzoic acid (768 mg, 4.5 mmol), 3,3-bis(methylthio)-2-(4-trifluoromethylpyrimidin-2-yl)acrylonitrile (1.45 g, 5.0 mmol, 1.1 eq.), 4-dimethylaminopyridine (550 mg, 4.5 mmol, 1 eq.), and potassium carbonate (622 mg, 4.5 mmol, 1 eq.) in ethanol (20 mL) was heated at 160° C. for 0.4 hr in a microwave. The mixture was cooled to room temperature, diluted with DCM, and washed with 1M hydrochloric acid. The DCM fraction was decanted, filtered, and concentrated under vacuum to give 2-[6-carboxybenzothiazol-2(3H)-ylidene]-2-(4-trifluoromethyl-pyrimidin-2-yl)acetonitrile (729 mg, 40% yield) as a brown solid.

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