7-(1-methylamino-5-azaspiro[2.4]heptane-5-yl)-8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid 以
吡啶 、
水 为溶剂,
以80%的产率得到7-[1-(N-formyl-N-methyl)-amino-5-azaspiro [2,4]heptane-5-yl]-1-cyclopropyl-8-chloro-6-fluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid