2-((E)-2,6-Bis-benzyloxy-hex-4-enyl)-4,5-dimethoxy-phenol 在
tetrabutylammonium tetrafluoroborate 、
乙酸酐 作用下,
生成 (2S,3aR,7R,8R,8aR)-2-Benzyloxy-8-benzyloxymethyl-5-methoxy-1,2,3,7,8,8a-hexahydro-3a,7-methano-azulene-6,9-dione 、 (2R,3aR,7R,8R,8aR)-2-Benzyloxy-8-benzyloxymethyl-5-methoxy-1,2,3,7,8,8a-hexahydro-3a,7-methano-azulene-6,9-dione