Heck cyclization strategy for preparation of erythrinan alkaloids: asymmetric synthesis of unnatural (-)-erysotramidine from L-tartaric acid

J Org Chem. 2015 Feb 6;80(3):1957-63. doi: 10.1021/jo5026157. Epub 2015 Jan 20.

Abstract

With an imide derived from L-tartaric acid as the starting material, ent-erysotramidine was synthesized for the first time. The synthesis features the use of the enantiopure synthon, prepared in a set of highly stereoselective reactions, including N-acyliminium cyclization, dihydrofuranyl ring formation via silver-catalyzed intramolecular alcohol addition to acetylene, and vinyl ether catalytic hydrogen reduction. The crucial step of the synthesis, assembly of ring A, was achieved by using Heck cyclization of (Z)-iodoolefin.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkaloids / chemical synthesis*
  • Alkaloids / chemistry*
  • Catalysis
  • Cyclization
  • Heterocyclic Compounds, 4 or More Rings / chemical synthesis*
  • Heterocyclic Compounds, 4 or More Rings / chemistry*
  • Molecular Structure
  • Stereoisomerism
  • Tartrates / chemistry*

Substances

  • Alkaloids
  • Heterocyclic Compounds, 4 or More Rings
  • Tartrates
  • erysotramidine
  • erythrinine