[(1R)-2-[(1S,4aR,4bS,8aS,10aR)-4b,8,8,10a-tetramethylspiro[1,3,4,4a,5,6,7,8a,9,10-decahydrophenanthrene-2,2'-oxirane]-1-yl]-1-(2-hydroxy-5-oxo-2H-furan-3-yl)ethyl] acetate 在
三氟化硼乙醚 作用下,
以
苯 为溶剂,
反应 0.08h,
以50%的产率得到[(1R)-2-[(1R,4aS,4bS,8aS,10aS)-2-formyl-4b,8,8,10a-tetramethyl-2,3,4,4a,5,6,7,8a,9,10-decahydro-1H-phenanthren-1-yl]-1-(2-hydroxy-5-oxo-2H-furan-3-yl)ethyl] acetate