反应详情

To a solution of 48.0 g of ethyl 5-benzylamino-1-cyclopropyl-7-chloro-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate (0.111 mol) dissolved in a mixture of 200 ml of acetic acid and ethanol was added 0.5 g of 5% Pd/C catalyst. Hydrogen gas was introduced at room temperature. The reaction was monitored with TLC and carried out for around 3 hours. Precipitates collected by filtration were dissolved in chloroform and filtered to remove the catalyst. After removing the solvent by evaporation, the residue was recrystallized from a mixture of chloroform and ethanol to give 32.0 g of ethyl 5-amino-1-cyclopropyl-7-chloro-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate (0.093 mol) in 83.9% yield.

1. customPrecipitates
2. filtrationcollected by filtration
3. dissolutionwere dissolved in chloroform
4. filtrationfiltered
5. customto remove the catalyst
6. customAfter removing the solvent
7. customby evaporation
8. customthe residue was recrystallized from a mixture of chloroform and ethanol