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

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Reaction Steps

7.16 g (13.9 mmol) of the above 2-[4-[N-acetyl-N-(3-iodopropyl)amino]-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one was dissolved in 150 mL of dimethylformamide under argon atmosphere, 5.68 g (69.5 mmol) of dimethylamine hydrochloride and 9.61 g (69.5 mmol) of potassium carbonate were added and the mixture was stirred at room temperature for 14 hours. Water was added to the reaction solution and the mixture was extracted once with ethyl acetate. The organic layer was washed once with water and 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=20:1-6:1-chloroform:methanol:aqueous ammonia=9:1:1) to give 4.13 g of 2-[4-[N-acetyl-N-(3-dimethylaminopropyl)amino]-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one (yield: 69%).

Provenance & Evidence