Unified Total Syntheses of Fawcettimine Class Alkaloids: Fawcettimine, Fawcettidine, Lycoflexine, and Lycoposerramine B
作者:Guojun Pan、Robert M. Williams
DOI:10.1021/jo3006045
日期:2012.5.18
syntheses of the lycopodium alkaloids fawcettimine, fawcettidine, lycoflexine, and lycoposerramine B have been accomplished through an efficient, unified, and stereocontrolled strategy that relies on a Diels–Alder reaction to construct the cis-fused 6,5-carbocycles with one all-carbon quaternary center. Access to the enantioselective syntheses of both antipodes of those alkaloids can be achieved by
石松生物碱 fawcettimine、fawcettimine、lycoflexine 和 lycoposerramine B 的全合成是通过一种高效、统一和立体控制的策略完成的,该策略依赖于 Diels-Alder 反应构建顺式融合的 6,5-碳环与一个全部-碳四元中心。通过 Sharpless 不对称二羟基化 (Sharpless AD) 对最早的中间体进行动力学拆分,可以实现对这些生物碱的两种对映体的对映选择性合成。与这些生物碱的现有方法相比,我们的合成路线对C -4 和C -15 立体中心具有优越的立体控制能力,并允许在 6 元环上进行更多的功能变化。