反应详情

To a suspension of methyl 1-ethyl-6,7-dihydroxy-4-oxo-1,4-dihydrocinnoline-3-carboxylate (11 g, 35.8 mmol), potassium carbonate (16.33 g, 118 mmol) and potassium iodide (1.189 g, 7.16 mmol) in acetone (200 mL) at room temperature, was added 1-(chloromethyl)-4-methoxybenzene (16.82 g, 107 mmol). The mixture was then heated to reflux overnight. After cooling to room temperature, the mixture was concentrated in vacuo and the residue was partitioned between dichloromethane and brine. The organic phase was separated, and the aqueous phase was extracted with dichloromethane several times. The combined organic extracts were dried over sodium sulfate, filtered and concentrated. The residue was purified by automatic silica gel column chromatography (Combiflash RF) eluting with methanol/dichloromethane (0-20%) to afford methyl 1-ethyl-6,7-bis((4-methoxybenzyl)oxy)-4-oxo-1,4-dihydrocinnoline-3-carboxylate (15 g, 24.68 mmol, 68.9% yield) as a light yellow solid. LCMS: (M+H)+: 505.1.

1. temperatureThe mixture was then heated
2. temperatureto reflux overnight
3. concentrationthe mixture was concentrated in vacuo
4. customthe residue was partitioned between dichloromethane and brine
5. customThe organic phase was separated
6. extractionthe aqueous phase was extracted with dichloromethane several times
7. dry with materialThe combined organic extracts were dried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was purified by automatic silica gel column chromatography (Combiflash RF)
11. washeluting with methanol/dichloromethane (0-20%)