Palladium-catalyzed [3,3]-rearrangement for the facile synthesis of allenamides

Org Lett. 2010 Jun 4;12(11):2574-7. doi: 10.1021/ol1007845.

Abstract

A [3,3]-rearrangement that is used for facile construction of chiral allenamides is described. A propargylic alcohol, a chlorophosphite, and Cbz-azide are combined to provide a propargylic phosphorimidate that, in the presence of catalytic palladium(II), rearranges to an allenamide. By varying the substitution pattern on the propargylic alcohol, mono-, di-, and trisubstituted allenamides can be accessed in good yields. Additionally, the use of an enantiomerically enriched propargylic alcohol enables the preparation of stereochemically defined allenamides.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkynes / chemistry
  • Amides / chemical synthesis*
  • Amides / chemistry
  • Catalysis
  • Combinatorial Chemistry Techniques
  • Molecular Structure
  • Palladium / chemistry*
  • Phosphites / chemistry
  • Propanols / chemistry
  • Stereoisomerism

Substances

  • Alkynes
  • Amides
  • Phosphites
  • Propanols
  • Palladium
  • propargyl alcohol