1-(5-carboxypentyl)-2-((1E,3E,5E)-5-(1,1-dimethyl-5,6-dihydro-1H-pyrrolo[3,2,1-ij]quinolin-2(4H)-ylidene)penta-1,3-dienyl)-1-methyl-1,4,5,6-tetrahydropyrrolo[3,2,1-ij]quinolinium chloride 、 O-(N-succinimidyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 在
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 1.0h,
以98%的产率得到2-((1E,3E,5E)-5-(1,1-dimethyl-5,6-dihydro-1H-pyrrolo[3,2,1-ij]quinolin-2(4H)-ylidene)penta-1,3-dienyl)-1-(6-(2,5-dioxopyrrolidin-1-yloxy)-6-oxohexyl)-1-methyl-1,4,5,6-tetrahydropyrrolo[3,2,1-ij]quinolinium trifluoroacetate