Chemistry of insect antifeedants from azadirachta indica (part 4): synthesis towards the limonoid azadirachtin; preparation of a functionalised decalin fragment
作者:Steven V. Ley、Antonio Abad Somovilla、Howard B. Broughton、Donald Craig、Alexandra M.Z. Slawin、Peter L. Toogood、David J. Williams
DOI:10.1016/s0040-4020(01)80075-2
日期:1989.1
Synthetic studies are described towards the functionalised decalin (2). This represents an advanced intermediate in a proposed total synthesis of the naturally occurring insect antifeedant azadirachtin (1) involving a late coupling reaction to form the C-8 – C-14 bond. The final route to (2) involved an intramolecular Diels-Alder reaction of (13) and subsequent internal Michael addition to construct
描述了针对功能化 dechalin 的合成研究 (2)。这代表了天然存在的昆虫抗摄食剂印楝素 (1) 的拟议全合成中的高级中间体,涉及形成 C-8 – C-14 键的晚期偶联反应。(2) 的最终途径涉及 (13) 的分子内 Diels-Alder 反应和随后的内部 Michael 添加以构建反式 -dechalin (26)。使用一系列立体选择性官能团相互转化,以良好的总产率将该化合物转化为 (2)。