反应详情

To a suspension of 8-methyl-6-nitro-3,4-dihydro-2(1H)-quinolinone (25 g), activated charcoal (8 g) and ferric chloride (2.5 g) in ethanol (700 ml) was dropwise added hydrazine monohydrate (30 g) over the period of 20 minutes at 77° C., and the mixture was stirred for 1 hour. Then, to the reaction mixture were added activated charcoal (3 g) and ferric chloride (1.5 g) and was dropwise added hydrazine monohydrate (10 g). After refluxed for 1.5 hours, the reaction mixture was filtered and the insoluble material was washed with ethanol and a mixture of ethanol and chloroform successively. The solvent was evaporated under reduced pressure and the residue was dissolved in chloroform. The organic layer was washed with water, dried over magnesium sulfate and concentrated under reduced pressure to give 6-amino-8-methyl-3,4-dihydro-2(1H)-quinolinone (19.5 g).

1. customover the period of 20 minutes
2. customat 77° C.
3. temperatureAfter refluxed for 1.5 hours
4. filtrationthe reaction mixture was filtered
5. washthe insoluble material was washed with ethanol
6. additiona mixture of ethanol and chloroform successively
7. customThe solvent was evaporated under reduced pressure
8. dissolutionthe residue was dissolved in chloroform
9. washThe organic layer was washed with water
10. dry with materialdried over magnesium sulfate
11. concentrationconcentrated under reduced pressure