1-Ethylpiperazine → HCID 14700568, compound

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Reaction Steps

1-Ethyl-8-(4-ethyl-1-piperazinyl)-7-fluoro-4-oxo- 1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid is prepared under the conditions of Reference Example 5 but starting from 1.6 g of 8-chloro-1-ethyl-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid and 2.3 g of 1-ethylpiperazine in 16 cm3 of pyridine. 1.4 g of 1-ethyl-8-(4-ethyl-1-piperazinyl)-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid are obtained in the form of a yellow solid melting at 287°-288° C., solvated by 1.6% of water.

Provenance & Evidence