在
palladium on activated charcoal
氢气 作用下,
以
乙酸乙酯 为溶剂,
反应 16.0h,
以90%的产率得到3-[3-[(4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-3-(2,2,2-trifluoroacetyl)oxy-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]oxy-2-[[(4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-3-(2,2,2-trifluoroacetyl)oxy-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]oxymethyl]-2-methylpropanoyl]oxy-2-[[3-[(4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-3-(2,2,2-trifluoroacetyl)oxy-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]oxy-2-[[(4R)-4-[(3R,5R,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-3-(2,2,2-trifluoroacetyl)oxy-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]oxymethyl]-2-methylpropanoyl]oxymethyl]-2-methylpropanoic acid