(S)-7-(3-carboxy-1,2,3,4-tetrahydroisoquinolin-2-yl)-1-cyclopropyl-6-fluoro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 在
sodium dithionite 、
potassium carbonate 作用下,
以53%的产率得到(S)-4-cyclopropyl-14-fluoro-1,6-dioxo-1,4,5,6,6a,7-hexahydro-12H-isoquinolino[2,3-a]pyrido[2,3-f]quinoxaline-2-carboxylic acid