反应详情

A mixture of 5-benzylamino-1-cyclopropyl-6,8-difluoro-7-(4-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (700 mg), 5% palladium-carbon (0.2 g), acetic acid (10 ml), and ethanol (15 ml) was stirred at room temperature for 30 minutes under a hydrogen stream. The catalyst was filtered off and the filtrate was evaporated under reduced pressure. After addition of water to the residue, the mixture was adjusted to pH 8 with aqueous ammonia. The resulting crystals were filtered to give 5-amino-1-cyclopropyl-6,8-difluoro-7-(4-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (510 mg), m.p. 254°-255° C.

1. filtrationThe catalyst was filtered off
2. customthe filtrate was evaporated under reduced pressure
3. additionAfter addition of water to the residue
4. filtrationThe resulting crystals were filtered