The synthesis of nine alkaloid sesquiterpenoids has been accomplished in only 5–8 steps in excellent overall yield (3–21 %). The dual nucleophilicity of the indole enabled two divergent termination pathways to be unlocked: an unprecedented N-termination and a previously challenging C-termination step. Furthermore, a bioinspired late-stage Witkop oxidation enabled the first total synthesis of greenwaylactams
九种生物碱倍半萜类化合物的合成仅需 5-8 个步骤即可完成,总产率极佳 (3-21%)。吲哚的双重亲核性使得两种不同的终止途径得以解锁:前所未有的 N 终止步骤和之前具有挑战性的 C 终止步骤。此外,受生物启发的后期 Witkop 氧化首次实现了 greenwaylactams A−C 的全合成。
A Chiral-Pool-Based Strategy to Access <i>trans-syn</i>-Fused Drimane Meroterpenoids: Chemoenzymatic Total Syntheses of Polysin, <i>N</i>-Acetyl-polyveoline and the Chrodrimanins
作者:Fuzhuo Li、Hans Renata
DOI:10.1021/jacs.1c08696
日期:2021.11.3
trans-syn-Fused drimane meroterpenoids are unique natural products that arise from contra-thermodynamic polycyclizations of their polyene precursors. Herein we report the first total syntheses of four trans-syn-fused drimane meroterpenoids, namely polysin, N-acetyl-polyveoline, chrodrimanin C, and verruculide A, in 7–18 steps from sclareolide. The trans-syn-fused drimane unit is accessed through an