(6R-trans)-7-amino-8-oxo-3-[[(1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triazin-3-yl)thio]methyl]-5-thia-1-azabicyclo[4,2,0]oct-2-ene-2-carboxylic acid 、
乙腈 、
sodium 2-ethylhexanoic acid 在
N,N-二异丙基乙胺 作用下,
以
N-甲基乙酰胺 、
二氯甲烷 、
乙酸乙酯 为溶剂,
以8%的产率得到[6R-[6α, 7β(Z)]]-7-[4-[[[2-Carboxy-3-[[(1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triazin-3-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl]-imino]methyl]-1-piperazinyl]-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid disodium salt