C
33H
56N
2O
7 、 C
29H
50N
2O
5*ClH 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
1-羟基苯并三唑 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 66.0h,
以74%的产率得到methyl (4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-[4-[[(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-dihydroxy-10,13-dimethyl-3-[4-[(2-methylpropan-2-yl)oxycarbonylamino]butanoylamino]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]amino]butanoylamino]-7,12-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate