、 Ethyl 1-cyclopropyl-5-ethoxycarbonylamino-6,7,8-trifluoro-1,4-dihydro-4-oxoquinoline-3-carboxylate 、
2-甲基哌嗪 以to give ethyl 1-cyclopropyl-5-ethoxycarbonylamino-6,8-difluoro-7-(3-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylate的产率得到ethyl 1-cyclopropyl-5-ethoxycarbonylamino-6,8-difluoro-7-(3-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylate