Ciprofloxacin → 4-Quinolone-3-carboxylic acid

Participants

Reaction Steps

3.3 g (0.01 mole) of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid in 50 ml of dimethylformamide are heated at 90° C. with 2.5 g (0.015 mole) of ethyl bromoacetate, 2.1 g (0.02 mole) of triethylamine and 2.5 g of potassium iodide for 5 hours. The reaction mixture is poured into 30 ml of water and the precipitate is filtered off with suction, washed with water and recrystallised from methanol. 2.5 g of 1-cyclopropyl-6-fluoro-7-[4-ethoxycarbonylmethyl)-1-piperazinyl]-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of melting point 192° to 194° C. are obtained.

Provenance & Evidence