(-)-methyl 2-<(2R)-<6-(6-<(1R,3aS,5S,7aS)-1-ethyl-2,3,3a,4,5,7a-hexahydro-4--indan-5-yl>hexa-3E,5E-dien-3-yl)>>-<(2R,5S,6R)-pyran-2-yl>propionate 在
lithium tetrafluoroborate 作用下,
以
乙腈 为溶剂,
反应 3.0h,
以44%的产率得到(7Z,9E)-(2R,3R,6S)-8-Ethyl-10-[(3R,3aR,5aR,6R,10aR,10bS)-3-ethyl-10-oxo-9-(2-trimethylsilanyl-ethoxymethyl)-1,2,3,3a,5a,6,9,10,10a,10b-decahydro-indeno[5,4-f]indol-6-yl]-3-hydroxy-2,6-dimethyl-deca-7,9-dienoic acid methyl ester