Asymmetric synthesis of (+)-vertine and (+)-lythrine

Org Biomol Chem. 2012 Aug 28;10(32):6473-9. doi: 10.1039/c2ob25880c. Epub 2012 Jul 5.

Abstract

The total syntheses of the Lythracea alkaloids (+)-vertine and (+)-lythrine are described. Enantioenriched pelletierine is used as a chiral building block and engaged into a two step pelletierine condensation leading to two quinolizidin-2-one diastereomers in a 8 : 1 ratio. The major product is used in the synthesis of (+)-vertine via aryl-aryl coupling and ring closing metathesis to provide a Z-alkene α to the lactone carbonyl function. The same procedure was used for (+)-lythrine after base induced epimerization of the main quinolizidin-2-one diastereomer. Alternative classical ring closure strategies like macrolactonisation or aryl-aryl coupling failed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkaloids / chemical synthesis*
  • Alkaloids / chemistry
  • Lythraceae / chemistry
  • Models, Molecular
  • Molecular Structure
  • Piperidines / chemical synthesis
  • Piperidines / chemistry

Substances

  • Alkaloids
  • Piperidines
  • isopelletierine
  • cryogenine
  • lythrine