N,N-bis-[2-(2-bromopropionylamino)ethyl]-5-[(2-bromopropionyl)amino]-2,4,6-triiodoisophthalic acid amide 、
Tribenzyl 1,4,7,10-Tetraazacyclododecane-1,4,7-tricarboxylate 在
sodium carbonate 作用下,
以
乙腈 为溶剂,
反应 20.0h,
以46%的产率得到2,4,6-triiodo-5-(2-{10-[1,4,7-tris-(benzyloxycarbonyl)-1,4,7,10-tetraazacyclododecanyl]}-propionyl)aminoisophthalic acid N,N-bis-(3-aza-5-methyl-4-oxopentane-1,5-diyl-{10-[1,4,7-tris-(benzyloxycarbonyl)-1,4,7,10-tetraazacyclododecanyl]})amide