1-Methylpiperazine → HCID 13960204, compound

Participants

Reaction Steps

16.89 g (0.05 mole) of 8-chloro-9-fluoro-5-methyl-6,7-dihydro-1,7-dioxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid ethyl ester was suspended in 300 ml of chloroform, 20.03 g (0.20 mole) of N-methylpiperazine was added thereto, and this mixture was stirred at 40°-50° C. for 4 hours. The resulting reaction solution was concentrated under reduced pressure and the residue thus obtained was purified by silica gel column chromatography [using a chloroform-methanol mixture (with a volume ratio of 10:1) as the developing solvent]. The fraction containing the desired product was evaporated to dryness under reduced pressure and the resulting residue was recrystallized from benzene to obtain 12.89 g (64.2% yield) of 9-fluoro-5-methyl-8-(4-methyl-1-piperazinyl)-6,7-dihydro 1,7-dioxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid ethyl ester in the form of yellow crystals.

Provenance & Evidence