达斯ringoffene d-Ribosehydrazon 5,DAS MIT巢穴ringgeschlossenen Ribosylhydrazinen 3,4,7 UND 8 IM Gleichgewicht steht,bildet MITβ-Dicarbonylverbindungen keine Pyrazolnucleoside。我们的合成方法是由Herstellung von Nucleosiden Gelingt的Jedoch dann和Freien合成的。Die dazu hergestellten D-Ribosehydrazon-derivate 13a-f stehen mit den entsprechenden Ribofuranosylhydrazinen 12和14 im Gleichgewicht。Sie liefern mitβ-Dimethoxyverbindungenje
Heterocyclic derivatives of sugars: an NMR study of the formation of 1-glycosyl-3,5-dimethyl-1 H-pyrazoles from hydrazones
作者:Warren C Kett、Michael Batley、John W Redmond
DOI:10.1016/s0008-6215(97)00007-4
日期:1997.4
Hydrazones were prepared by treatment of monosaccharides and disaccharides with hydrazine hydrate and converted in high yield to mixtures of 1-glycosyl-3,5-dimethyl-1 H-pyrazoles by reaction with pentan-2,4-dione (acetylacetone). The isomeric products were separated by HPLC and characterized by NMR spectroscopy. This represents a new approach to the introduction of a heteroaromatic label into sugars under nonacidic and nonreducing conditions, and it is a process likely to be especially useful for glycan hydrazones obtained from glycoproteins by hydrazinolysis or beta elimination in the presence of hydrazine. (C) 1997 Elsevier Science Ltd.
Mahmoud, Egyptian Journal of Chemistry, 2005, vol. 48, # 2, p. 251 - 257