(R)-methyl 4-((1R,3aR,6aS,8S,10aS,13aR)-8-acetoxy-3a,7,7,10a,13a-pentamethyl-4,5,11-trioxohexadecahydro-1Hbenzo[a]cyclopenta[f ][10]annulen-1-yl)pentanoate 在
二苯甲酮 作用下,
以
氘代苯 为溶剂,
反应 24.0h,
以44%的产率得到(R)-methyl-4-((1R,3aR,5aR,6aS,8S,10aS,10bS,12aR)-8-acetoxy-10b-hydroxy-7,7,10a,12a-tetramethyl-13-oxotetradecahydro-1H-3a,5a-methanocyclopenta[f ]indeno[2,1-b]-oxocin-1-yl)pentanoate