2,6-dimethyl-6-acetoxy-4-benzoyl-3-hydroxy-2,4-cyclohexadien-1-one 在
cesium hydroxide 作用下,
以
甲醇 为溶剂,
以55%的产率得到(1S,2R,6R,7R,8R,9R)-2-Benzoyl-5,6,9-trihydroxy-12-[1-hydroxy-1-phenyl-meth-(E)-ylidene]-1,4,6,9-tetramethyl-tricyclo[6.2.2.0
2,7]dodec-4-ene-3,10,11-trione