N-(4-Fluorophenyl)-N′-[4-(2-aminopyridin-4-yloxy)-3-fluorophenyl]malonamide (34 mg) was dissolved in N,N-dimethylformamide (0.5 ml), and then triethylamine (0.047 ml) and cyclopropanecarbonyl chloride (0.016 ml) were added dropwise thereto under a nitrogen atmosphere at room temperature, followed by stirring for 1 hr. To the reaction mixture were added a 1 N aqueous solution of sodium hydroxide (1.5 ml) and methanol (1.0 ml), followed by stirring and extracting with ethyl acetate. The organic layer was washed with water and a saturated aqueous solution of ammonium chloride in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (FUJI Silysia NH, eluent; ethyl acetate). Fractions containing the target compound were concentrated to give a residue, which was then dried in vacuum to provide the titled compound (21.1 mg, 53%) as white powder.
