反应详情

6-Hydroxy-quinoline-2-carboxylic acid (2.3 g, 0.012 mol) was dissolved in absolute ethanol (150 ml). Sulfuric acid (0.550 ml, 0.0096 mol) was added and the mixture was refluxed for 16 hours. After cooling to room temperature the ethanol was evaporated and 60 ml of ethyl acetate, 50 ml of cooled water were added. The pH was adjusted to 7 with solid NaHCO3. Extraction and concentration of the organic phase gave the title product as a light yellow solid that was used for the next steps without purification (2.1 g, 81% of theory). MS (m/e)=218.4 (M+H)+.

1. temperaturethe mixture was refluxed for 16 hours
2. customwas evaporated
3. addition60 ml of ethyl acetate, 50 ml of cooled water were added
4. extractionExtraction and concentration of the organic phase