4-[[(3,5-Ditert-butylphenyl)methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]methyl]benzoic acid 、
(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3,7,12-trihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-N-[3-[3-[[(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3,7,12-trihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]amino]propylamino]propyl]pentanamide 在
三乙胺 、
3-羟基-1,2,3-苯并三嗪-4(3H)-酮 、
N,N'-二环己基碳二亚胺 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 、
N,N-二甲基甲酰胺 为溶剂,
反应 20.0h,
以35%的产率得到tert-butyl N-[[4-[bis[3-[[(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3,7,12-trihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]amino]propyl]carbamoyl]phenyl]methyl]-N-[(3,5-ditert-butylphenyl)methyl]carbamate