methyl (1R,4S)-7-oxabicyclo<2.2.1>hept-2-ene-2-carboxylate 、
(3E)-(2S,4R,6R)-tetrahydro-2,4-dimethoxy-6-<6-(phenylthio)-3,5-hexadienyl>-2H-pyran 在
2,6-二叔丁基-4-甲基苯酚 作用下,
以
甲苯 为溶剂,
反应 14.0h,
以70%的产率得到methyl (1S,4R,4aS,5R,8S,8aR)-1,3,4,5,8,8a-hexahydro-5-(phenylthio)-8-[2-((2R,4R,6S)-tetrahydro-4,6-dimethoxy-2H-pyran-2-yl)-ethyl]-1,4-epoxynaphthalene-4a(2H)-carboxylate