4-(asparaginyl-4-iodophenylalanylphenylalanyl-D-tryptophyl-N-ε-t-butoxycarbonyl-lysyl-O-t-butylthreonylphenylalanylamino)butanoic acid 在
1-羟基苯并三唑 、
N,N'-二环己基碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 20.0h,
以31%的产率得到cyclo-<4-(asparaginyl-4-iodophenylalanylphenylalanyl-D-tryptophyl-N-ε-t-butoxycarbonyl-lysyl-O-t-butylthreonylphenylalanylamino)butanoic acid>