Evolution of a Synthetic Strategy for Complex Polypyrrole Alkaloids: Total Syntheses of Curvulamine and Curindolizine
作者:Jun Xuan、Karl T. Haelsig、Michael Sheremet、Paulo A. Machicao、Thomas J. Maimone
DOI:10.1021/jacs.0c13465
日期:2021.2.24
evolution of a synthetic program aimed at accessing the flagship metabolites curvulamine and curindolizine which are presumably a dimer and trimer of a C10N biosynthetic building block, respectively. Starting with curvulamine, we detail several strategies to merge two simple, bioinspired fragments, which while ultimately unsuccessful, led us toward a pyrroloazepinone building block-based strategy and an improved
最近从Curvularia sp.中分离出结构上前所未有的含有多个富电子吡咯单元的抗菌生物碱。和Bipolaris maydis真菌。本文记录了旨在获取旗舰代谢物 curvulamine 和 curindolizine 的合成程序的演变,这些代谢物可能是 C 10的二聚体和三聚体N 生物合成构件,分别。从 curvulamine 开始,我们详细介绍了几种策略来合并两个简单的、受生物启发的片段,虽然最终没有成功,但我们转向了基于 pyrroloazepinone 构建单元的策略和改进的这种 10π-芳族杂环的合成。然后设计了一个两步成环工艺以锻造保守的四环双吡咯结构并推进到各种后期中间体;然而,不幸的是,脱羧失败阻碍了curvulamine的全合成。通过定制我们的环化前体,最终通过使用氰醇亲核试剂实现了 10 步全合成曲维胺的成功。然后尝试实现curvulamine与额外的C 10的仿生耦合