6-(5-carboxypentyl)-5,6-dimethyl-1,2,3,6-tetrahydropyrrolo[3,2,1-ij]quinolinium-7-sulfonate 、
6,6-dimethyl-5-((1E,3E)-4-(N-phenylacetamido)buta-1,3-dienyl)-1,2,3,6-tetrahydropyrrolo[3,2,1-ij]quinolinium-7-sulfonate 在
吡啶 作用下,
以
乙酸酐 为溶剂,
生成 (E)-2-((2E,4E)-5-(6-(5-Carboxypentyl)-6-methyl-7-sulfo-1,2,3,6-tetrahydropyrrolo[3,2,1-ij]quinolinium-5-yl)penta-2,4-dienylidene)-1,1-dimethyl-2,4,5,6-tetrahydro-1H-pyrrolo[3,2,1-ij]quinoline-9-sulfonate