Cesium carbonate → N-[6-(2-fluoro-4-nitrophenoxy)[1,2,4]triazolo[1,5-a]pyridin-2-yl]cyclopropanecarboxamide

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To a solution of N-(6-hydroxy[1,2,4]triazolo[1,5-a]pyridin-2-yl)cyclopropanecarboxamide (2 g, 9.16 mmol) and 1,2-difluoro-4-nitrobenzene (1.46 g, 9.16 mmol) in dimethyl sulfoxide (20 mL) was added cesium carbonate (4.48 g, 13.7 mmol), and the mixture was stirred at room temperature for 17 hr. The reaction mixture was filtered through celite, and the filtrate was diluted with water and ethyl acetate, and extracted twice with ethyl acetate. The combined organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and filtered, and the solvent was evaporated under reduced pressure. The obtained residue was washed with ethyl acetate to give the title compound (1.5 g, 46%) as a white solid.

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