Synthesis and biological evaluation of a backbone-modified phytoalexin elicitor

C. M. Timmers, J. J. Turner, C. M. Ward, G. A. Van Der Marel, M. L.C.E. Kouwijzer, P. D.J. Grootenhuis, J. H. Van Boom

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43 Scopus citations


Two suitably protected building blocks (11 and 33) for the preparation of amide-linked heptaglucoside mimetic 2, an analogue of the naturally occurring phytoalexin elicitor 1a, were readily accessible by glycal chemistry. Sequential elongation of terminal glucuronide 21 with laminaribiosyl hemiaminal 33 and anomeric amine 11 by EDC. HOBI-catalyzed condensation and two-step conversion of the C6-OTr moiety into the corresponding carboxylate function afforded homogeneous carbopeptoid 2 in high overall yield. It was found that replacement of the acetal linkages by the more rigid amide bonds destroys the phytoalexin-elicitor activity.

Original languageEnglish (US)
Pages (from-to)920-929
Number of pages10
JournalChemistry - A European Journal
Issue number6
StatePublished - Jun 1997


  • Bioorganic chemistry
  • Carbohydrates
  • Glycosides
  • Peptide bonds
  • Phytochemistry


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