在
碘 作用下,
以
苯 为溶剂,
以87%的产率得到[(3E,3aS,4S,6S,7S,7aR)-4-[[tert-butyl(dimethyl)silyl]oxymethyl]-3-[(2E,4R,6E)-8-[(2R,3S,6R,8R,10S)-10-[tert-butyl(diphenyl)silyl]oxy-3-methyl-2-propan-2-yl-1,7-dioxaspiro[5.5]undecan-8-yl]-4,6-dimethylocta-2,6-dienylidene]-6-methyl-3a-trimethylsilyloxy-5,6,7,7a-tetrahydro-4H-1-benzofuran-7-yl]oxy-tri(propan-2-yl)silane