作者:Vittorio Caprio、Jarrod Ward、Alison Johnson、George Clark
DOI:10.1055/s-0029-1216946
日期:2009.10
structure of huperzine A, are described. Cyclisation of (2-pyridyl)methyl radicals derived from two model [(2-phenylselenomethyl)-3-pyridyl]cyclohexenones, proceeds in 6-exo-trig mode to give bicyclo[3.3.1]nonanes. Cyclisation yields are related to the substitution pattern and relative stereochemistry about the enone ring. Cyclisation precursors were accessed by either conjugate addition of a (3-pyridyl)cuprate
描述了基于自由基环化的石杉碱A核心结构的合成路线。衍生自两个模型[(2-苯基硒代甲基)-3-吡啶基]环己烯的(2-吡啶基)甲基自由基的环化反应以6- exo - trig模式进行,得到双环[3.3.1]壬烷。环化产率与烯酮环的取代模式和相对立体化学有关。通过将(3-吡啶基)铜酸酯共轭加到烯酮上或通过(3-吡啶基)取代的烯烃与拉瓦尔二烯的狄尔斯-阿尔德环加成反应来获得环化前体。 石杉碱甲-自由基环化-铜酸盐-硒-Diels-Alder