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

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Reaction Steps

A 150 mg portion of 7-[3-(5-bromo-2-thienyl)-1-piperazinyl]-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid was dissolved in a mixture of 0.6 ml of 37% formaldehyde and 0.75 ml of glacial acetic acid, heated on a steam bath for 2 hours and then evaporated. The residue was diluted with 3 ml of water, adjusted to pH 7 with 1N sodium hydroxide and the solid collected, giving 120 mg of the desired product, mp 243°-245° C. (dec.).

Provenance & Evidence