(2E,4E)-5-Methyl-7-((1S,4aS,8aS)-5,5,8a-trimethyl-2-methylene-decahydro-naphthalen-1-yl)-hepta-2,4-dienoic acid methyl ester 在
三氟化硼乙醚 作用下,
反应 72.0h,
以0.25 g的产率得到methyl (E)-3-[(1S,4aR,4bS,8aS,10aR)-2,4b,8,8,10a-pentamethyl-4,4a,5,6,7,8a,9,10-octahydro-1H-phenanthren-1-yl]prop-2-enoate