6-amino-2-[bis(benzyloxycarbonylmethylamino)]hexanoic acid benzyl ester ditrifluoroacetate 、
1-[(3-{[(2,5-dioxo-1-pyrrolidinyl)oxy]carbonyl}benzoyl)oxy]-2,5-pyrrolidinedione 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
以60%的产率得到6-(3-{5-benzyloxycarbonyl-5-[bis(benzyloxycarbonylmethylamino)]pentylcarbamoyl}benzoylamino)-2-[bis(benzyloxycarbonylmethylamino)]hexanoic acid benzyl ester