4-(((((3S,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl)oxy)carbonyl)oxy)-2-methylbutan-2-yl methyl oxalate 在
2-(2-吡啶)-苯并咪唑 、
二苯基硅烷 、 magnesium chloride 、 nickel dichloride 、
锌 作用下,
以
N,N-二甲基乙酰胺 为溶剂,
以76%的产率得到(3S,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl isopentyl carbonate