在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
以28%的产率得到(2S,3S,4S,5R,6S)-3,4,5-Tris-benzyloxy-6-[(3S,8S,9S,10R,13R,14S,17R)-17-((R)-1,5-dimethyl-hexyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yloxy]-tetrahydro-pyran-2-carboxylic acid methyl ester