3-[(1R,4aR,5S,6R,8aR)-5-[(R)-2-[(S)-3,3-dimethyloxiran2-yl]-2-hydroxyethyl]-5,8a-dimethyl-2-methylene-6-(hydroxy)decahydronaphthalen-1-yl]methyl-5,6-dimethyl-2-methoxy-4H-pyran-4-one 在
4-甲基苯磺酸吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 4.0h,
以79%的产率得到3-[(2R,3R,4aR,6aR,7R,10aR,10bR)-6a,10b-dimethyl-2-hydroxy-3-(1-hydroxy-1-methylethyl)-8-(methylene)-perhydro-1H-benzo[f]chromen-7-yl]methyl-5,6-dimethyl-2-methoxy-4H-pyran-4-one