Dimethyl Sulfoxide → 6-Fluoro-1-methyl-7-(4-methylpiperazinyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid

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Reaktionsschritte

2.55 g (0.01 mol) of 7-chloro-6-fluoro-1-methyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid, 4.5 cm3 of 1-methylpiperazine (0.011 mol) and 32 cm3 of DMSO were heated at 110° C. for 4 hours. After cooling, the mixture was taken up in 150 cm3 of water. The crystalline precipitate was filtered off, washed and recrystallised from 100 cm3 of methylcellosolve. 1.3 g of 6-fluoro-1-methyl-7-(4-methylpiperazinyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid, m.p. 304° C. (decomposition), were obtained.

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