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Keywords:

  • alkaloids;
  • lactones;
  • natural products;
  • nitrogen heterocycles;
  • total synthesis
Thumbnail image of graphical abstract

Tetracyclic monoterpene alkaloid alstilobanine A was obtained in racemic form. The pivotal steps of the total synthesis are a novel conjugate addition of an ester enolate with a nitrosoalkene, as well as a formal [2+2] intramolecular cycloaddition leading to a β-lactone to generate the requisite cis-fused 2-azadecalin moiety of the alkaloid. TMSE=trimethylsilylethoxy, Ts=4-toluenesulfonyl.