8,9-dichloro-5-methyl-6,7-dihydro-1,7-dioxo-1H, 5H-benzo[ij]quinolizine-2-carboxylic acid ethyl ester 、
2-甲基哌嗪 在
silica gel 、 desired product 、
苯 作用下,
以
乙腈 为溶剂,
反应 3.0h,
以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的产率得到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