反应详情

A 59.7 g portion of the above ester was suspended in 425 ml of dimethylformamide, 76.6 g of potassium carbonate was added and this mixture was stirred in an oil bath at 80°-90° C. An 89 ml portion of ethyl iodide was added, the mixture was stirred at 80°-90° C. for 18 hours and then evaporated. The residue was dissolved in water and then extracted with dichloromethane. The extract was washed with water, dried, filtered through hydrous magnesium silicate and evaporated in vacuo. The solid was recrystallized from ethanol, giving 38 g of 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, ethyl ester.

1. stirringthe mixture was stirred at 80°-90° C. for 18 hours
2. customevaporated
3. dissolutionThe residue was dissolved in water
4. extractionextracted with dichloromethane
5. washThe extract was washed with water
6. customdried
7. filtrationfiltered through hydrous magnesium silicate
8. customevaporated in vacuo
9. customThe solid was recrystallized from ethanol