3-[(1R,4aR,5S,6R,8aR)-5-[(S)-2-[(R)-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 3.0h,
以86%的产率得到3-{(2S,3R,5aR,7aS,8R,11aS,11bS)-2,3-dihydroxy-9-methylene-4,4,7a-(trimethyl)perhydro[b]oxepin-8-ylmethyl}-5,6-dimethyl-2-methoxy-4H-pyran-4-one