Piperazine → HCID 14700578, compound

Participants

Reaction Steps

7-Fluoro-4-oxo-8-(1-piperazinyl)-1-tert.-butyl-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid is prepared under the conditions of Reference Example 5 but starting from 1.7 g of 8-chloro-7-fluoro-4-oxo-1-tert.-butyl-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid and 4.3 g of piperazine in 20 cm3 of pyridine. The pure product is obtained after a single recrystallization from 20 cm3 of dimethylformamide. 1.25 g of 7-fluoro-4-oxo-8-(1-piperazinyl)-1-tert.-butyl-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid are isolated in the form of a yellow solid melting at 90° C., solvated by 4.5% of water.

Provenance & Evidence