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Sydnone Ribosides as a Platform for the Synthesis of Pyrazole C-Nucleosides: A Unified Synthesis of Formycin B and Pyrazofurin.

Jakob BoutonSerge Van CalenberghJan Hullaert
Published in: Organic letters (2020)
The C-nucleoside natural products formycin B and pyrazofurin were synthesized in seven steps employing a sydnone riboside as common intermediate. Sydnone ribosides were synthesized via a direct Lewis acid catalyzed dehydrative glycosylation reaction. We demonstrated that these can be used for the diversity-oriented synthesis of pyrazole C-nucleoside analogues via thermal 1,3-dipolar cycloaddition reactions with various alkynes, giving access to the pyrazole C-nucleoside natural products, as well as opening new avenues for exploring nucleoside chemical space.
Keyphrases
  • molecular docking
  • molecular dynamics simulations