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• 491845-17-1 C₅₅H₇₇N₅O₃₀ 

Relevant academic research and scientific papers

Prompt Chemoenzymatic Synthesis of Diverse Complex-Type Oligosaccharides and Its Application to the Solid-Phase Synthesis of a Glycopeptide with Asn-Linked Sialyl-undeca- and Asialo-nonasaccharides

We describe herein the preparation of 24 pure asparagine-linked oligosaccharides (Asn-oligosaccharides) from asparagine-linked biantennary complex-type sialylundecasaccharide [(NeuAc-α-2,6-Gal-β -1,4-GlcNAc-β-1,2-Man-α-1,6/1,3-)2-Man-β -1,4-GlcNAc-β-1,4-GlcNAc-β-1-asparagine, 2] obtained from egg yolk. Our synthetic strategy aimed at adapting branch specific exo-glycosidases digestion (β-D-galactosidase, N-acetyl-β-D-glucosaminidase and α-D-mannosidase) of the individual asialo-branch after preparation of monosialyloligosaccharides obtained from 2 by acid hydrolysis of NeuAc. In order to perform branch specific exo-glycosidase digestion, isolation of pure monosialyloligosaccharides obtained was essential. However, isolation of two kinds of monosialyloligosaccharides are difficult by HPLC due to their highly hydrophilic nature. Therefore, we examined chemical protection with hydrophobic protecting (Fmoc and benzyl) groups. These chemical protection enabled us to separate the monosialyloligosaccharides by use of a HPLC column (ODS) on synthetic scales. Using these pure monosialiloligosaccharides enable us to obtain 24 Asn-linked oligosaccharides (100 mg scale) within a few weeks by branch specific exo-glycosidase digestions (α-D-neuraminidase, β-D-galactosidase, N-acetyl-β-D-glucosaminidase and α-D-mannosidase). In addition, solid-phase synthesis of glycopeptide having Asn-linked sialyl-undeca- and asialo-nonasaccharides thus obtained, was also performed on an acid labile HMPA-PEGA resin.

PROCESS FOR PRODUCING SUGAR CHAIN ASPARAGINE DERIVATIVE

The present invention provides a process for preparing a sugar chain asparagine derivative. According to the process, various isolated sugar chain asparagine derivatives useful in the field of the development of pharmaceuticals and the like can be conveniently obtained in a large amount as compared to that of the prior art. The present invention also provides a process for preparing a sugar chain asparagine and a process for preparing a sugar chain via a step for preparing a sugar chain asparagine derivative. The present invention further provides a novel sugar chain asparagine derivative, a sugar chain asparagine and a sugar chain.