Norfloxacin → 1-Ethyl-1,4-dihydro-6-fluoro-4-oxo-7-(4-phthalidyl-1-piperazinyl)quinoline-3-carboxylic acid

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Reaction Steps

A mixture of 1-ethyl-1,4-dihydro-6-fluoro-4-oxo-7-(1-piperazinyl)quinoline-3-carboxylic acid 0.5 g, 3-hydroxyphthalide 0.24 g and dimethylformamide 5 ml was heated at 100°-110° C. for 3 hours under stirring. After cooling, ethanol was added, and the insoluble matters were collected by filtration. The precipitates obtained were washed with ethanol and dried. 0.70 g (99%) of 1-ethyl-1,4-dihydro-6-fluoro-4-oxo-7-(4-phthalidyl-1-piperazinyl)quinoline-3-carboxylic acid was obtained as colorless powders.

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