2-[(Z)-5-(3,4-Dimethoxy-phenyl)-1,4-dimethyl-pent-4-enyl]-4,5-dimethoxy-phenol 在
tetrabutylammonium tetrafluoroborate 作用下,
以
乙酸酐 为溶剂,
以66%的产率得到(3R,3aR,7S,8R,8aS)-8-(3,4-Dimethoxy-phenyl)-5-methoxy-3,8a-dimethyl-1,2,3,7,8,8a-hexahydro-3a,7-methano-azulene-6,9-dione