Total synthesis of the Daphniphyllum alkaloid daphenylline

Nat Chem. 2013 Aug;5(8):679-84. doi: 10.1038/nchem.1694. Epub 2013 Jun 30.

Abstract

The Daphniphyllum alkaloids are a large class of natural products isolated from a genus of evergreen plants widely used in Chinese herbal medicine. They display a remarkable range of biological activities, including anticancer, antioxidant, and vasorelaxation properties as well as elevation of nerve growth factor. Daphenylline is a structurally unique member among the predominately aliphatic Daphniphyllum alkaloids, and contains a tetrasubstituted arene moiety mounted on a sterically compact hexacyclic scaffold. Herein, we describe the first total synthesis of daphenylline. A gold-catalysed 6-exo-dig cyclization reaction and a subsequent intramolecular Michael addition reaction, inspired by Dixon's seminal work, were exploited to construct the bridged 6,6,5-tricyclic motif of the natural product at an early stage, and the aromatic moiety was forged through a photoinduced olefin isomerization/6π-electrocyclization cascade followed by an oxidative aromatization process.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkaloids / chemical synthesis*
  • Catalysis
  • Saxifragaceae / chemistry*

Substances

  • Alkaloids
  • daphenylline

Associated data

  • PubChem-Substance/163563777
  • PubChem-Substance/163563778
  • PubChem-Substance/163563779
  • PubChem-Substance/163563780
  • PubChem-Substance/163563781
  • PubChem-Substance/163563782
  • PubChem-Substance/163563783
  • PubChem-Substance/163563784
  • PubChem-Substance/163563785
  • PubChem-Substance/163563786
  • PubChem-Substance/163563787
  • PubChem-Substance/163563788
  • PubChem-Substance/163563789
  • PubChem-Substance/163563790
  • PubChem-Substance/163563791
  • PubChem-Substance/163563792