反应详情

A mixture of ethyl 7-methoxy-3-quinolinecarboxylate (12.0 g) and 47% HBr (200 ml) was refluxed for 24 h. The precipitated crystals (12.63 g) were collected and added to a mixture of ethanol (400 ml) and conc.H2SO4 (2 ml). After refluxing for 20 h, the reaction mixture was concentrated, diluted with saturated aqueous sodium bicarbonate, and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried (MgSO4), and concentrated to give ethyl 7-hydroxy-3-quinoline-carboxylate (5.70 g, 51%). Recrystallization from ethyl acetate-hexane gave colorless prisms, 179-180° C.

1. temperaturewas refluxed for 24 h
2. customThe precipitated crystals (12.63 g) were collected
3. additionadded to a mixture of ethanol (400 ml)
4. temperatureAfter refluxing for 20 h
5. concentrationthe reaction mixture was concentrated
6. additiondiluted with saturated aqueous sodium bicarbonate
7. extractionextracted with ethyl acetate
8. washThe ethyl acetate layer was washed with water
9. dry with materialdried (MgSO4)
10. concentrationconcentrated