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103. The synthesis and characterization of new optically active 'dimeric' 'pineno'-[4,5]-fused 2,2′-bipyridines linked without spacer or by small spacer groups

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Published
  • Nicholas C. Fletcher
  • F. Richard Keene
  • Marco Ziegler
  • Helen Stoeckli-Evans
  • Heiko Viebrock
  • Alex Von Zelewsky
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<mark>Journal publication date</mark>26/06/1996
<mark>Journal</mark>Helvetica Chimica Acta
Issue number4
Volume79
Number of pages11
Pages (from-to)1192-1202
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Linked chiral bipyridines 2-4 are prepared by combining two optically active 'pineno'-[4,5]-fused 2,2′-bipyridines in a stereoselective reaction (Scheme 1). These potential ligands are new members of the 'chiragen' family, and are characterized by NMR spectroscopy and, in the case of 2 and 3 by single-crystal X-ray analysis. A new synthesis of 'dipineno'-[4,5;4′,5′]-fused 2,2′-bipyridine 8 is described, which, when coupled, gives additional four chiral centres to the analogous 'chiragen' series (→9). Analysis of the CD spectra allowed conformational information about the solution species to be determined.