Solvent-free enantioselective Friedländer condensation with wet 1,1'-binaphthalene-2,2'-diamine-derived prolinamides as organocatalysts

J Org Chem. 2013 Jun 7;78(11):5349-56. doi: 10.1021/jo400522m. Epub 2013 May 28.

Abstract

Wet unsupported and supported 1,1'-binaphthalene-2,2'-diamine (BINAM) derived prolinamides are efficient organocatalysts under solvent-free conditions at room temperature to perform the synthesis of chiral tacrine analogues in good yields (up to 93%) and excellent enantioselectivies (up to 96%). The Friedländer reaction involved in this process takes place with several cyclohexanone derivatives and 2-aminoaromatic aldehydes, and it is compatible with the presence of either electron-withdrawing or electron-donating groups at the aromatic ring of the 2-aminoaryl aldehyde derivatives used as electrophiles. The reaction can be extended to cyclopentanone derivatives, affording a regioisomeric but separable mixture of products. The use of the wet silica gel supported organocatalyst, under solvent-free conditions, for this process led to the expected product (up to 87% enantiomeric excess), with its reuse being possible at least up to five times.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Diamines / chemistry*
  • Molecular Structure
  • Naphthalenes / chemistry*
  • Proline / analogs & derivatives*
  • Proline / chemistry
  • Stereoisomerism
  • Tacrine / chemical synthesis*
  • Tacrine / chemistry

Substances

  • 1,1'-binaphthyl-2,2'-diamine
  • Diamines
  • Naphthalenes
  • Tacrine
  • Proline
  • prolinamide