反应详情

A 50% dimethylamine aqueous solution (2.5 ml) was added to a DMF solution (25 ml) of phenyl[3-(4-fluoro-2-nitrophenoxy)propyl]carbamate (5.89 g, 17.6 mmol), and the mixture was stirred at room temperature for 24 hours. Water was added to the reaction mixture, and the resulting mixture was extracted with ethyl acetate. The organic layer was washed with a saturated sodium chloride aqueous solution twice, and concentrated under reduced pressure. The residue was then purified by silica gel column chromatography (dichloromethane: ethyl acetate=19:1→4:1→2:1). The purified product was concentrated to dryness under reduced pressure to thereby obtain 4.10 g of oily pale yellow 3-[3-(4-fluoro-2-nitrophenoxy)propyl]-1,1-dimethyl urea (yield: 82%).

1. extractionthe resulting mixture was extracted with ethyl acetate
2. washThe organic layer was washed with a saturated sodium chloride aqueous solution twice
3. concentrationconcentrated under reduced pressure
4. customThe residue was then purified by silica gel column chromatography (dichloromethane: ethyl acetate=19:1→4:1→2:1)
5. concentrationThe purified product was concentrated to dryness under reduced pressure