7α.12α-dihydroxy-3α-chlorocarbonyloxy-5β-cholanoic acid-(24)-methyl ester 、
[N(2),N(2)-bis[2-[bis(1,1-dimethylethoxy)-2-oxoethyl]amino]-ethyl]-L-lysine 1,1-dimethylethyl ester 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以79%的产率得到[3α(S),5β,7α,12α]-3-[[[[6-(1,1-dimethylethoxy)-5-[bis[2-[bis[2-(1,1-dimethylethoxy)-2-oxoethyl]amino]ethyl]amino]-6-oxohexyl]amino]carbonyl]oxy]-7,12-dihydroxycholan-24-oic acid methyl ester