D-phenylalanyl L-α-hydroxyisovaleryl O-acetyl L-tyrosyl D-lactic acid t-butyl ester 、
benzyloxycarbonyl D-phenylalanyl L-α-hydroxyisovaleryl L-phenylalanyl D-lactyl D-phenylalanyl L-α-hydroisovaleryl L-phenylalanyl D-lactic acid 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 72.0h,
以78%的产率得到benzyloxycarbonyl D-phenylalanyl L-α-hydroxyisovaleryl L-phenylalanyl D-lactyl D-phenylalanyl L-α-hydroisovaleryl L-phenylalanyl D-lactyl D-phenylalanyl L-α-hydroxyisovaleryl O-acetyl-L-tyrosyl D-lactic acid t-butyl ester