By the usual method of synthesis of fluoroquinolones: By condensation of 8-(difluoromethoxy)-6,7-difluoro-1-methyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (I) with 1-(2-pyrimidinyl)piperazine (II) in pyridine.
By the usual method of synthesis of fluoroquinolones: By condensation of 8-(difluoromethoxy)-1-ethyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (I) with 1-(2-methoxyphenyl)piperazine (II) in pyridine.