Asymmetric total synthesis of (-)-lingzhiol via a Rh-catalysed [3+2] cycloaddition

Nat Commun. 2014 Dec 8:5:5707. doi: 10.1038/ncomms6707.

Abstract

The development of efficient reactions for the one-pot construction of bicyclic ring systems bearing two quaternary carbon centres at their bridgehead positions represents a significant challenge to synthetic chemistry. The development of new methods capable of overcoming this challenge is highly desirable, because this motif can be found in a wide range of natural products with significant biological activities. Herein, we report an efficient [3+2] cycloaddition reaction between an enal and an alleno rhodium species, which was generated in situ from the corresponding enynol via a retro metal-propargylation reaction, to give [3.3.0] and [3.4.0] bicyclic systems bearing two quaternary atoms at their bridgehead positions. The developed chemistry has been successfully applied to the asymmetric total synthesis of natural product (-)-lingzhiol (4) for the first time in 17 steps.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon / chemistry
  • Catalysis
  • Cyclization
  • Cycloaddition Reaction / methods*
  • Models, Molecular
  • Molecular Conformation
  • Molecular Structure
  • Phosphines / chemistry
  • Rhodium / chemistry*
  • Stereoisomerism
  • Substrate Specificity
  • Terpenes / chemical synthesis*
  • Terpenes / chemistry*

Substances

  • Phosphines
  • Terpenes
  • lingzhiol
  • Carbon
  • Rhodium