反应详情

In 5.3 ml of 47% hydrobromic acid was suspended 0.53 g of 1-cyclopropyl-6-fluoro-8-methyl-7-[2-(p-toluenesulfonyl)isoindolin-5-yl]-1,4-dihydro-4-oxoquinoline-3 carboxylic acid, and 0.28 g of phenol and 3.2 ml of propionic acid were added to the suspension, after which the resulting mixture was heated under reflux for one hour under a nitrogen stream. The reaction mixture was concentrated under reduced pressure, and ethanol was added to the residue obtained, after which the crystals formed were collected by filtration, to obtain 0.38 g of colorless, crystalline 1-cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid hydrobromide. The hydrobromide obtained was suspended in 3.8 ml of ethanol and then dissolved in 7.6 ml of 0.5N aqueous sodium hydroxide solution, after which a carbon dioxide gas was blown into the solution. The crystals formed were collected by filtration, to obtain 0.27 g of colorless, crystalline 1-cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid.

1. additionwere added to the suspension
2. temperatureafter which the resulting mixture was heated
3. temperatureunder reflux for one hour under a nitrogen stream
4. concentrationThe reaction mixture was concentrated under reduced pressure, and ethanol
5. additionwas added to the residue
6. customobtained
7. customafter which the crystals formed
8. filtrationwere collected by filtration