Asymmetric synthesis of enantioenriched (+)-elaeokanine A

J Org Chem. 2006 Jul 21;71(15):5674-8. doi: 10.1021/jo060717q.

Abstract

The key transformation in the total synthesis of (+)-elaeokanine A was accomplished by asymmetric deprotonation of N-Boc pyrrolidine, followed by the reaction of the in situ generated enantioenriched stereogenic cuprate reagent with (E)-4-bromo-1-iodo-1-trimethylsilyl-1-butene with retention of configuration. N-Boc deprotection, followed by a one-pot olefin isomerization and intramolecular amine alkylation afforded a bicyclic vinyl bromide that was converted into (+)-elaeokanine A by sequential halogen metal exchange and reaction of the organolithium reagent with N-butanoylmorpholine.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Alkenes / chemistry
  • Alkylation
  • Amines / chemistry
  • Bridged Bicyclo Compounds / chemical synthesis*
  • Bridged Bicyclo Compounds / chemistry
  • Copper / chemistry
  • Cyclization
  • Indolizines / chemistry*
  • Lithium / chemistry
  • Molecular Structure
  • Morpholines / chemistry
  • Organometallic Compounds / chemistry
  • Stereoisomerism
  • Vinyl Compounds / chemistry

Substances

  • Alkenes
  • Amines
  • Bridged Bicyclo Compounds
  • Indolizines
  • Morpholines
  • Organometallic Compounds
  • Vinyl Compounds
  • indolizine
  • Copper
  • vinyl bromide
  • morpholine
  • Lithium