Lithium;2-[5-[3',6'-bis(diethylamino)-3-oxospiro[isoindole-1,9'-xanthene]-2-yl]-1,3-dioxoisoindol-2-yl]acetate 、 O-(N-succinimidyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 以
N,N-二甲基甲酰胺 为溶剂,
反应 2.0h,
以36%的产率得到2,5-dioxopyrrolidin-1-yl 2-(5-(3',6'-bis(diethylamino)-3-oxospiro[isoindoline-1,9'-xanthen]-2-yl)-1,3-dioxoisoindolin-2-yl)acetate