β-sitosterol 4-nitrophenyl carbonate 、
4-二甲基氨基丁胺 在
2-[(2-氨基乙基)甲基氨基]乙醇 作用下,
以
氯仿 为溶剂,
以89.7 %的产率得到(3S,8S,9S,10R,13R,14S,17R)-17-((2R,5R)-5-ethyl-6-methylheptan-2-yl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl (4-(dimethylamino)butyl)carbamate