作者:Martin E. Maier、Alexander Bayer
DOI:10.1002/ejoc.200600361
日期:2006.9
The tricyclic 6-7-6 core structure of the triterpene salvadione (1) was obtained in an efficient manner from the aryl bromide 16 and the alkyl iodide 35 carrying a methylenecyclohexane group at the terminus. Alkylation of the anion derived from 16 with the iodide 35 gave the tethered system 36. This compound was converted into the allylic bromide 40. Finally, a Lewis acid mediated intramolecular Friedel–Crafts
从芳基溴化物16和末端带有亚甲基环己烷基团的烷基碘化物35以有效的方式获得了三萜salvadione(1)的三环6-7-6核结构。衍生自 16 的阴离子与碘化物 35 烷基化得到系链系统 36。该化合物转化为烯丙基溴 40。最后,路易斯酸介导的分子内 Friedel-Crafts 烷基化以良好的总产率提供目标结构 13。三环化合物13的合成代表了salvadione (1)的正式全合成。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)