6,7,8-trifluoro-1-(2-fluoroethyl)-1,4-dihydro-4-oxo-3-quinoline 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
乙腈 为溶剂,
以76%的产率得到6,8-difluoro-7-[3,7-diazabicyclo[3.3.0]oct-1(5)-en-3-yl]-1-(2-fluoroethyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid