反应详情

To a solution of quinoline-6-carboxylic acid (2.8 g, 16 mmol) in ethanol (100 mL) was added concentrated sulfuric acid (2 mL). The reaction was heated to reflux overnight. The solvent was evaporated to give a brown residue that was taken up in ethyl acetate (150 mL). The mixture was washed with water (2×30 mL), saturated aqueous sodium bicarbonate (2×30 mL), and brine (2×30 mL). The organic layer was dried over sodium sulphate, filtered, and concentrated to an oil. Purification by flash column chromatography gave the title compound (2.0 g, 81%) as a brown solid.

1. temperatureThe reaction was heated
2. temperatureto reflux overnight
3. customThe solvent was evaporated
4. customto give a brown residue that
5. washThe mixture was washed with water (2×30 mL), saturated aqueous sodium bicarbonate (2×30 mL), and brine (2×30 mL)
6. dry with materialThe organic layer was dried over sodium sulphate
7. filtrationfiltered
8. concentrationconcentrated to an oil
9. customPurification by flash column chromatography