- Reaction of sugars with 2-hydrazinopyridine, precursors for seco C-nucleosides of 1,2,4-triazolo[4,3-a]pyridine.
Reaction of sugars with 2-hydrazinopyridine, precursors for seco C-nucleosides of 1,2,4-triazolo[4,3-a]pyridine.
Nucleosides, nucleotides & nucleic acids (2004-04-29)
E S H El Ashry, M M Abdul-Ghani
PMID15113024
RÉSUMÉ
Reaction of 2-hydrazinopyridine (1) with D-xylose, D-galactose, D-glucose and D-fructose afforded the corresponding hydrazones mainly in the acyclic forms 2, 3, 6 and 11 with minor amounts of the cyclic structures. Oxidative cyclization of the hydrazones with bromine in methanol resulted in the formation of the 3-(polyhydroxyalkyl)-1,2,4-triazolo[4,3-a]pyridine derivatives 13-15 whose acetylation afforded the acetylated derivatives 16-18. Assignment of 1D and 2D NMR spectral data in addition to 15N NMR experiments led to complete characterization of the products.
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