反应详情

To a mixture of 4-benzyloxy-2,3-dimethylquinoline-1-oxide (21.2 g), potassium carbonate (20.9 g), and acetonitrile (400 mL) was added p-toluenesulfonyl chloride (18.8 g), followed by stirring at room temperature for 12 hours. Insolubles were removed by filtration, and the filtrate was concentrated under reduced pressure. Water (500 mL) was added to the residue, followed by twice extractions with ethyl acetate (500 mL). The organic layer was washed with saturated brine and then dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=5/1) to obtain p-toluenesulfonic acid [4-(benzyloxy)-3-methylquinolin-2-yl]methyl ester (13.4 g).

1. customInsolubles were removed by filtration
2. concentrationthe filtrate was concentrated under reduced pressure
3. additionWater (500 mL) was added to the residue
4. extractionfollowed by twice extractions with ethyl acetate (500 mL)
5. washThe organic layer was washed with saturated brine
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe solvent was evaporated under reduced pressure
8. customthe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=5/1)