Triethylamine → N-[4-[[2-(Aminocarbonyl)-4-pyridinyl]oxy]-2,5-difluorophenyl]-N′-(4-fluorophenyl)-1,1-cyclopropanedicarboxamide

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Reaction Steps

1-(4-Fluorophenylaminocarbonyl)cyclopropanecarboxylic acid (1.35 g) was dissolved in tetrahydrofuran (25.0 ml) under a nitrogen atmosphere, and triethylamine (1.06 ml) was added dropwise while cooling in an ice water bath, followed by stirring for 15 min. Then thionyl chloride (0.439 ml) was added at the same temperature, followed by stirring for 1.5 hr. To the reaction mixture was added dropwise at the same temperature a mixture of 4-(4-amino-2,5-difluorophenoxy)pyridine-2-carboxamide (1.0 g), tetrahydrofuran (12 ml) and triethylamine (1.06 ml), followed by stirring at 0° C. for 24 hr and 45 min. The reaction mixture was partitioned between ethyl acetate (70 ml) and a 2N aqueous solution of sodium hydroxide (15 ml). The organic layer was washed with a 2N aqueous solution of sodium hydroxide (15 ml) twice, 1N hydrochloric acid (15 ml) three times and a saturated aqueous solution of sodium hydrogencarbonate (10 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure. The resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent; heptane:ethyl acetate=1:1, 1:2, then ethyl acetate), and fractions containing the target compound were concentrated under reduced pressure. The residue was dried under reduced pressure to provide the titled compound as a white solid (372.8 mg, 21%).

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