3,3'-{ethane-1,2-diylbis[imino(2-oxoethane-2,1-diyl)oxy]}dibenzoic acid 、 methyl {7-[(1-amino-2-methylindolizin-3-yl)carbonyl]-2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl}acetate hydrochloride 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
三乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 10.5h,
以94%的产率得到methyl 2,2'-{ethane-1,2-diylbis[imino(2-oxoethane-2,1-diyl)oxybenzene-3,1-diylcarbonylimino(2-methylindolizine-1,3-diyl)carbonyl(2,4-dioxo-1,4-dihydroquinazoline-7,3(2H)-diyl)]}diacetate