反应详情

14.17 g (0.04 mole) of 8,9-dichloro-5-methyl-6,7-dihydro-1,7-dioxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid ethyl ester was suspended in 250 ml of acetonitrile, 12.02 g (0.12 mole) of 2-methylpiperazine was added thereto, and this mixture was stirred at 50°-60° C. for 3 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 12.75 g (76.3% yield) of 9-chloro-5-methyl-8-(3-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.

1. customThe resulting reaction solution
2. concentrationwas concentrated under reduced pressure
3. customthe residue thus obtained
4. customwas purified by silica gel column chromatography [
5. additionThe fraction containing the desired product
6. customwas evaporated to dryness under reduced pressure
7. customthe resulting residue was recrystallized from benzene