作者:Leo A. Paquette、Donald T. DeRussy、Robin D. Rogers
DOI:10.1016/s0040-4020(01)85945-7
日期:1988.1
2-isopropenylcyclopentenes (8b or 8c). Oxyanion formation within the resulting alcohols is followed by skeletal rearrangement at room temperature. Careful product analysis has revealed the [3,3] sigmatropic reaction manifold to be followed almost exclusively. Only in the case of 13 is a modest amount (4%) of formal antarafacialretention [1,3] sigmatropic bridgehead carbon migration in evidence. Consequently
β,γ-不饱和酮双环[2.2.1]庚-2-en-7-one(10)和7,7-二甲氧基双环[2.2.1]庚-2-en-5-one(15)与1-金属化的反式-1-甲氧基丁二烯(7a或7b)和2-异丙烯基环戊烯(8b或8c)缩合。在室温下,在生成的醇中形成高氧阴离子,然后进行骨架重排。仔细的产品分析表明,[3,3]σ反应流形几乎要遵循。仅在13例的情况下,才有少量(4%)的正式前界面保留[1,3]σ桥头碳迁移。因此,这些醇固有的结构特征不利于将电子重组重定向至替代的异构化过程。