Chiral macrocyclic aliphatic oligoimines derived from trans-1,2-diaminocyclohexane

Chemistry. 2007;13(31):8688-95. doi: 10.1002/chem.200700648.

Abstract

Aliphatic dialdehydes of rigid structures having a cyclohexane, a bicyclo[2.2.2]octane or a [7]triangulane skeleton, have been condensed with enantiomerically pure trans-1,2-diaminocyclohexane to give [3+3] or [2+2] macrocyclization products. Unlike acyclic aliphatic imines, these macrocyclic oligoimines show enhanced stabilities and their structures in the crystals could be determined by X-ray diffraction analyses. The enantiomerically pure [7]triangulane dialdehyde showed remarkable diastereoselectivity in the condensation with the two enantiomers of trans-1,2-diaminocyclohexane: only one of the enantiomers gave a [2+2] macrocyclization product. Circular dichroism measurements combined with computational analysis show that the lowest energy electronic transition in these cyclic oligoimines is of n-pi* type.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallography, X-Ray
  • Cyclohexylamines / chemistry*
  • Imines / chemical synthesis*
  • Imines / chemistry
  • Macrocyclic Compounds / chemical synthesis*
  • Macrocyclic Compounds / chemistry
  • Models, Molecular
  • Molecular Conformation
  • Stereoisomerism

Substances

  • Cyclohexylamines
  • Imines
  • Macrocyclic Compounds
  • 1,2-cyclohexanediamine