1-(2,4-difluorophenyl)-6,7,8-trifluoro-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid 、
1,8-二氮杂双环[5.4.0]十一碳-7-烯 、 1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole dihydrobromide 以
甲醇 、
乙腈 为溶剂,
以74%的产率得到7-[3,7-diazabicyclo [3.3.0] oct-1(5)-en-3-yl]-1-(2,4-difluorophenyl)-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid