Unified Strategy for the Synthesis of the “Miscellaneous” <i>Lycopodium</i> Alkaloids: Total Synthesis of (±)-Lyconadin A
作者:Alakesh Bisai、Scott P. West、Richmond Sarpong
DOI:10.1021/ja8028069
日期:2008.6.1
Total synthesis of the Lycopodium alkaloid lyconadin A was achieved in 18 steps starting from a readily available vinylogous ester and bromopicoline. The key step in the total synthesis is a proximity-driven oxidative C-N bond-forming reaction that yields the lyconadin pentacycle from a tetracyclic precursor. The key tetracycle, which has been prepared for the first time, is a versatile intermediate
石松生物碱 lyconadin A 的全合成是从容易获得的乙烯酯和溴甲基吡啶开始的 18 个步骤中实现的。全合成的关键步骤是邻近驱动的氧化 CN 键形成反应,该反应从四环前体产生lyconadin 五环。首次制备的关键四环是一种多功能中间体,可用于多种石松生物碱的全合成。该计划成功的关键是有效制备吡啶环化的环庚二烯三环,它有望成为获取各种含有天然产物的七元环的通用策略。