7-Chloro-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid → 7-[3-(5-Bromo-2-thienyl)-1-piperazinyl]-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid

Beteiligte Stoffe

Reaktionsschritte

A 3 g portion of 2-(5-bromo-2-thienyl)piperazine was suspended in 8 ml of dry pyridine. An 820 mg portion of 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid was added and the mixture was heated in a pressure bottle, under argon, at 120°-130° C. for 18 hours, then cooled, filtered and evaporated to dryness. The residue was evaporated from toluene and this residue purified by chromatography, eluting with chloroform:water saturated methanol (9:1). The appropriate fractions were combined, evaporated and recrystallized from dimethylformamide-ether, giving 440 mg of the desired product, mp 233°-235° C. (dec.).

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