Water → 2-[4-[N-acetyl-N-(3-dimethylaminopropyl)amino]-3-fluorophenyl]-6,8-difluoro-5-(4-methylpentylamino)-4H-1-benzopyran-4-one

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Reaction Steps

1.01 g (2.33 mmol) of 2-[4-[N-acetyl-N-(3-dimethylaminopropyl) amino]-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one obtained in Example 127 (2) was dissolved in 20 mL of dimethylformamide under argon atmosphere, 190 mg (4.75 mmol) of sodium hydride (60% oil dispersion) and 0.66 mL (4.7 mmol) of 1-bromo-4-methylpentane were added under ice-cooling and the mixture was stirred at room temperature for 1 hour. Water was added to the reaction solution and mixture was extracted twice with ethyl acetate. The organic layer was washed once with an aqueous saturated solution of sodium chloride and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (chloroform:methanol=20:1-9:1) to give 595 mg of 2-[4-[N-acetyl-N-(3-dimethylaminopropyl)amino]-3-fluorophenyl]-6,8-difluoro-5-(4-methylpentylamino)-4H-1-benzopyran-4-one (yield: 49%).

Provenance & Evidence