methyl (2R)-2-[(3S,5S,8R,9S,10S,13S,14S,17R)-3-hydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-6-methylheptanoate 在
重铬酸吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以93%的产率得到methyl (2R)-2-[(5S,8R,9S,10S,13S,14S,17R)-10,13-dimethyl-3-oxo-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]-6-methylheptanoate