(S)-7-(2-carboxypyrrolidin-1-yl)-1-cyclopropyl-6-fluoro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 在
sodium dithionite 、
potassium carbonate 作用下,
以
水 为溶剂,
以55 %的产率得到(S)-4-cyclopropyl-11-fluoro-1,6-dioxo-1,4,5,6,6a,7,8,9-octahydropyrido[2,3-f]pyrrolo[1,2-a]quinoxaline-2-carboxylic acid