A simple and efficient highly enantioselective synthesis of alpha-ionone and alpha-damascone

J Org Chem. 2004 Dec 10;69(25):8959-62. doi: 10.1021/jo049012j.


An efficient highly enantioselective (ee > or =99%) synthesis of alpha-ionone and alpha-damascone is described. Both enantiomers of title compounds were synthesized through two straightforward pathways diverging from enantiopure (R)- or (S)-alpha-cyclogeraniol. These versatile building blocks were obtained by regioselective ZrCl(4)-promoted biomimetic cyclization of (6S)- or (6R)-(Z)-6,7-epoxygeraniol, respectively, followed by deoxygenation of the so formed secondary alcohol. The chiral information was encoded by a highly regioselecive Sharpless asymmetric dihydroxylation of inexpensive geranyl acetate.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Molecular Conformation
  • Norisoprenoids / chemical synthesis*
  • Stereoisomerism


  • Norisoprenoids
  • alpha-ionone