Synthesis of Possible Metabolites of 1-Cyclopropyl-1,4-dihydro-6-fluoro-5-methyl-7-(3-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic Acid (Grepafloxacin, OPC-17116).
in vivo antibacterial activity. In order to identify the structures of the metabolites of grepafloxacin, 17 possiblemetabolites were prepared. Among them, 6 compounds were found to be actual metabolites (2a, b, 4a, b and 6a, b) of grepafloxacin in rats, dogs and/or humans. The antibacterial activities of these metabolites were found to be weaker than that of grepafloxacin.