Dimethylformamide → 3-methoxy-2,2-dimethylpropionic acid 5-[[3-(2-acetoxyethoxy)-2-fluoro-5-methoxyphenyl]-(4-{amino[benzoylimino]methyl}phenylamino)methyl]-2-pyrimidin-2-yl-2H-[1,2,4]triazol-3-yloxymethyl ester

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Under nitrogen atmosphere, a mixture of acetic acid 2-{3-[(4-{amino[benzoylimino]methyl}phenylamino)-(5-oxo-1-pyrimidin-2-yl-4,5-dihydro-1H-[1,2,4]triazol-3-yl)methyl]-2-fluoro-5-methoxyphenoxy)ethyl ester (441 mg), 3-methoxy-2,2-dimethylpropionic acid chloromethyl ester (Example 4a, 373 mg), potassium hydrogen carbonate (241 mg), and DMF (20 mL) was stirred at 55° C. for 15 hours. The resulting mixture was poured into ethyl acetate (200 mL) and water (50 mL). After shaking the resulting mixture, the organic layer was collected, sequentially washed twice with water (50 mL) and with saturated aqueous sodium chloride solution (50 mL), and dried over anhydrous magnesium sulfate. The resulting mixture was filtered, and the filtrate obtained was concentrated under reduced pressure. The residue obtained was purified by NAM silica gel column chromatography (mixed solvent of methanol-ethyl acetate) to obtain the captioned compound (184 mg).

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