Hydrochloric Acid → HCID 13340207, compound

Participants

Reaction Steps

A mixture of 3.3 g (0.01 mol) of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(piperazin-1-yl)-quinoline-3-carboxylic acid and 2.8 g (0.01 mol) of 4-nitrophenyl 2-(pyrazol-1-yl)-ethyl carbonate in 40 ml of pyridine is stirred for 1 day at room temperature. Thereafter, it is diluted with 30 ml of water and acidified with 2N hydrochloric acid, and the precipitate is filtered off under suction and recrystallised from glycol monomethyl ether. 2.8 g (60% of theory) of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-{-4-[(pyrazol-1-yl)-ethoxycarbonyl]-piperazin-1-yl}-quinoline-3-carboxylic acid of melting point 205°-208° C. are obtained.

Provenance & Evidence