Tremorgenic indole alkaloid studies. 6. Preparation of an advanced intermediate for the synthesis of penitrem D. Synthesis of an indole oxocane
作者:Amos B. Smith、John N. Haseltine、Melean Visnick
DOI:10.1016/s0040-4020(01)83440-2
日期:1989.1
We describe here an efficient synthesis of tricyclic aniline 9, an advanced synthetic intermediate which embodies the B-C-D rings of the penitrems (A–F), a small family of tremorgenic mycotoxins produced by the ergot fungus Penicillium crustosum. In addition, we demonstrate the feasibility of a general synthetic tactic for the sequential generation of the E, F, and A rings by construction of a diminutive
我们在这里描述了三环苯胺9的有效合成,这是一种先进的合成中间体,它体现了麦角真菌青霉产生的一小类震颤性霉菌毒素— Penitrems(AF)的BCD环。此外,我们证明了通过构建天然产物的小版本,特别是吲哚-氧杂环丁烷23来依次生成E,F和A环的一般合成策略的可行性。我们苯胺9方法的核心是丙烯酸甲酯到烯酮16的光化学[2 + 2]-环己二酮,随后依次进行Robinson环空和Semmler-Wolff芳构化。组装23需要进行改良的Madelung吲哚合成,再加上新型的酸促进的双环化反应(47 → 46),以安装氧烷环系统。