C-Glucopyranosyl-1,2,4-triazol-5-ones: Synthesis and inhibition of glycogen phosphorylase

Éva Bokor, Zsolt Széles, T. Docsa, P. Gergely, L. Somsák

Research output: Contribution to journalArticle

8 Citations (Scopus)


Various C-glucopyranosyl-1,2,4-triazolones were designed as potential inhibitors of glycogen phosphorylase. Syntheses of these compounds were performed with O-perbenzoylated glucose derivatives as precursors. High temperature ring closure of N1 -carbamoyl-C-β-D-glucopyranosyl formamidrazone gave 3-β-D-glucopyranosyl-1,2,4-triazol-5-one. Reaction of N1 -tosyl-C-β-D-glucopyranosyl formamidrazone with ClCOOEt furnished 3-β-D-glucopyranosyl-1-tosyl-1,2,4-triazol-5-one. In situ prepared β-D-glucopyranosylcarbonyl isocyanate was transformed by PhNHNHBoc into 3-β-D-glucopyranosyl-1-phenyl-1,2,4-triazol-5-one, while the analogous 1-(2-naphthyl) derivative was obtained from the unsubstituted triazolone by naphthalene-2-boronic acid in a Cu(II) catalyzed N-arylation. Test compounds were prepared by Zemplén deacylation. The new glucose derivatives had weak or no inhibition of rabbit muscle glycogen phosphorylase b: the best inhibitor was 3-β-D-glucopyranosyl-1-(2-naphthyl)-1,2,4-triazol-5-one (Ki = 80 μM).

Original languageEnglish
JournalCarbohydrate Research
Publication statusAccepted/In press - Oct 8 2015


  • 1,2,4-Triazol-5-one
  • C-glucosyl derivative
  • Glycogen phosphorylase
  • Inhibitor

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Organic Chemistry

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