Dimethylacetamide → Carbonic acid 1-(5-{(R)-(4-{amino[benzoylimino]methyl}phenylamino)-[2-fluoro-3-(2-hydroxyethoxy)-5-methoxyphenyl]methyl}-2-pyrimidin-2-yl-2H-[1,2,4]-triazol-3-yloxy)propyl ester cyclohexyl ester

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To a mixture of N-[1-amino-1-(4-{[(R)-[2-fluoro-3-(2-hydroxyethoxy)-5-methoxyphenyl]-(5-oxo-1-pyrimidin-2-yl-4,5-dihydro-1H-[1,2,4]triazol-3-yl)methyl]amino}phenyl)methylidene]benzamide (Example 12b, 200 mg) and DMA (2 mL), carbonic acid 1-chloropropyl ester cyclohexyl ester [CAS No. 108098-53-9] (300 mg) and potassium hydrogen carbonate (100 mg) were added, and the resulting mixture was stirred at 55° C. for 36 hours. The resulting mixture was poured into ethyl acetate and water. After shaking the mixture, the organic layer was collected, sequentially washed twice with water and with saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate. The resulting mixture was filtered, and the filtrate obtained was concentrated under reduced pressure. The residue obtained was crudely purified by NAM silica gel column chromatography (mixed solvent of methanol-ethyl acetate) to obtain a crudely purified product (120 mg).

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