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Keywords:

  • alkaloids;
  • aza-Wittig reaction;
  • divergent synthesis;
  • natural products;
  • Schmidt reaction
Thumbnail image of graphical abstract

Four from one: The four title alkaloids (structures shown in blue box) have been synthesized by using a common versatile intermediate with a 6/5/5 tricyclic skeleton. This tricyclic intermediate could be easily assembled by using an intramolecular carbene addition/cyclization and a Dieckmann condensation/Tsuji–Trost allylation as key steps.