Stereoselective Synthesis of the 3-Aminopropyl Glycosides of α-d-Xyl-(1→3)-β-d-Glc and α-d-Xyl-(1→3)-α-d-Xyl-(1→3)-β-d-Glc and of Their Corresponding N-Octanoyl Derivatives

Vadim Krylov; Nadezhda Ustyuzhanina; Alexey Grachev; Hans Bakker; Nikolay Nifantiev

doi:10.1055/s-2007-990784

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Stereoselective Synthesis of the 3-Aminopropyl Glycosides of α-d-Xyl-(1→3)-β-d-Glc and α-d-Xyl-(1→3)-α-d-Xyl-(1→3)-β-d-Glc and of Their Corresponding N-Octanoyl Derivatives

Vadim Krylov^a, Nadezhda Ustyuzhanina^b, Alexey Grachev^b, Hans Bakker^c, Nikolay Nifantiev*^b
^a Higher Chemical College, Russian Academy of Sciences, Miusskaya Square 9, 125047 Moscow, Russian Federation
^b Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russian Federation
Fax: +7(495)1358784; e-Mail: nen@ioc.ac.ru;
^c Hannover Medical School (MHH), Department of Cellular Chemistry OE4330, Carl-Neuberg-Straße 1, 30625 Hannover, Germany

Abstract

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Abstract

The stereoselective synthesis of the spacer-armed disaccharide α-d-Xyl-(1→3)-β-d-Glc-O-(CH₂)₃NH₂ and trisaccharide α-d-Xyl-(1→3)-α-d-Xyl-(1→3)-β-d-Glc-O-(CH₂)₃NH₂, as well as of their N-octanoyl derivatives, was performed for their subsequent use as acceptors and reference samples in xylosyltransferase assays. These structures are found as O-linked glycans on epidermal growth factor (EGF) domains of several blood-clotting factors and Notch. The target products were prepared by glycosylation with a 3-O-acetylated xylosyl donor that was previously found to be an effective α-xylosylating agent. However, in this paper we show that the structure of the glycosyl acceptor could influence the stereochemical results of the glycosylation and even lead to reversed stereoselectivity in the case of one acceptor.

Key words

carbohydrates - glycosylations - stereoselectivity - α-xylosylations - remote participation

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