Catalytic asymmetric rearrangement of allylic N-aryl trifluoroacetimidates. A useful method for transforming prochiral allylic alcohols to chiral allylic amines

Org Lett. 2003 May 29;5(11):1809-12. doi: 10.1021/ol0271786.

Abstract

[reaction: see text] A useful method for the conversion of prochiral allylic alcohols to chiral allylic amines of high enantiopurity is reported. N-(4-Methoxyphenyl)trifluoroacetimidates are excellent substrates for the palladium(II)-catalyzed allylic imidate rearrangement as the allylic trifluoroacetamide products can be deprotected in two steps to provide chiral nonracemic allylic amines. Di-mu-chlorobis[(eta(5)-(S)-(pR)-2-(2'-(4'-isopropyl))oxazolinylcyclopentadienyl,1-C,3'-N))(eta(4)-tetraphenylcyclobutadiene)cobalt]dipalladium (6a, COP-Cl) is a superior catalyst because it does not require activation with silver salts and provides rearranged allylic trifluoroacetamides in good yields and high enantiomeric purities.

Publication types

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

MeSH terms

  • Alcohols / chemical synthesis
  • Alcohols / chemistry
  • Allyl Compounds / chemical synthesis*
  • Allyl Compounds / chemistry
  • Amines / chemical synthesis
  • Amines / chemistry
  • Catalysis
  • Imidoesters / chemical synthesis*
  • Imidoesters / chemistry
  • Indicators and Reagents
  • Silver / chemistry
  • Stereoisomerism

Substances

  • Alcohols
  • Allyl Compounds
  • Amines
  • Imidoesters
  • Indicators and Reagents
  • Silver