1-环丙基-6,7,8-三氟-4-氧代-1,4-二氢喹啉-3-羧酸 、
N-((吗啉-2-基)甲基)乙胺 以to give 1-cyclopropyl-7-[2-(ethylaminomethyl)morpholino]6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, melting at 210°-213° C. with decomposition的产率得到1-cyclopropyl-7-[2-(ethylaminomethyl)morpholino]-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid