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Keywords:

  • alkaloids;
  • cascade reactions;
  • heterocycles;
  • natural products;
  • total synthesis
Thumbnail image of graphical abstract

Double take: The total syntheses of the title compounds were accomplished in a highly convergent manner. The approach features the regio- and diastereoselective Polonovski–Potier-type reaction for the coupling of two aspidosperma skeletons and the formation of the dihydrofuran ring. Troc=2,2,2-trichloroethoxycarbonyl.