Journal ArticleDOI
A facile synthesis of N-acetylneuraminic acid glycal
TLDR
In this paper, the peracetylated N-acetylneuraminic acid glycal was obtained from the reaction mixture by simple filtration and subsequent evaporation of the solvent.Abstract:
Treatment of the readily available peracetylated N-acetylneuraminic acid glycosyl chloride [methyl 5-acetamido-4,7,8,9-tetra-O-acetyl-2-chloro-2,3,5-trideoxy-β-D-glycero-D-galactononulopyranosonate)] with anhydrous Na 2 HPO 4 in refluxing MeCN quantitatively affords the peracetylated N-acetylneuraminic acid glycal [methyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2,6-anhydro-D-glycero-D-galacto-non-2-enonate], which can be isolated from the reaction mixture by simple filtration and subsequent evaporation of the solvent. No glycal formation was detected at room temperature even after prolonged treatment with Na 2 HPO 4 . The method proposed is experimentally simple and allows ready preparation of substantial amounts of the title compound, which is an important intermediate in sialic acid chemistry.read more
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Journal ArticleDOI
Synthesis and Elimination of C-3-Labeled Thiosialosides
TL;DR: The synthesis of C-3-labeled phenylthio sialic acid derivatives and an investigation of stereoselectivity in elimination reactions for the synthesis of 2,3-dehydro derivatives (glycals) is described.
Journal ArticleDOI
Access to 3-O-Functionalized N-Acetylneuraminic Acid Scaffolds.
TL;DR: O-Alkylation of the C3 hydroxyl group generated novel 3-O-functionalized Neu5Ac derivatives that provided the corresponding unsaturated derivatives upon elimination.
Journal ArticleDOI
The first example of unpromoted sialylation of a secondary alcohol
Journal ArticleDOI
Phase-Transfer Catalyzed Microfluidic Glycosylation: A Small Change in Concentration Results in a Dramatic Increase in Stereoselectivity
I. V. Myachin,Leonid O. Kononov +1 more
TL;DR: In this paper , the phase transfer catalysis (PTC) is widely used in glycochemistry for the preparation of aryl glycosides by the glycosylation reaction, and it is shown that the outcome of this reaction, performed under microfluidic conditions using a Comet X-01 micromixer (at 2 μL/min flow rate), nonlinearly depends on the concentration of N-acetylsialyl chloride 1 (5-200 mmol/L).
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