Methyl 8-bromo-2-(ethylthio)-4-oxo-4H-chromene-6-carboxylate (850 mg, 2.29 mmol, prepared as described in Example 9) and 3,5-difluoroaniline (621 mg, 4.81 mmol) in DMA (10 mL) were stirred at 50° C. overnight. The reaction mixture was diluted with water/ethyl acetate. The organic layer was washed with brine, dried over MgSO4 and concentrated. The crude product was purified by flash chromatography on silica gel eluting with 0 to 25% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford methyl 8-(1-(3,5-difluorophenylamino)ethyl)-2-(ethylthio)-4-oxo-4H-chromene-6-carboxylate (550 mg, 57%) as a off-white solid. Mass Spectrum: M+H+ 420.
