Synthesis and Conformational Investigations of Sulfated Carbohydrates[1]

Probst, Katrin C. and Wessel, Hans 2001. Synthesis and Conformational Investigations of Sulfated Carbohydrates[1]. Journal of Carbohydrate Chemistry 20 (7&8) , p. 549. 10.1081/CAR-100108273

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Abstract

Starting from the finding that methyl 2,3,4,6-tetra-O-sulfonato-β-D-glucopyranoside (3) existed in a conformational equilibrium of the two chair conformers, the effect of sulfation on conformational equilibria was further investigated using a number of sulfated saccharides. Three sulfate groups on positions 3,4, and 6 or two on positions 2 and 3 were not sufficient to induce the conformational change as shown with methyl 2-amino-2-deoxy-3,4,6-tri-O-sulfonato-β-D-glucopyranoside. N-Sulfation of the amino group of the latter compound furnished an equilibrium of chair conformers with less 1 C 4 conformer content than for 3. The presence of persulfated methyl β-D-galactopyranoside in the usual 4 C 1 conformation suggested the involvement of the 4-O-sulfate in the effect. Methyl 2,3,4-tri-O-sulfonato-β-D-xylopyranoside was found to prefer the “all-axial” 1 C 4 conformation demonstrating that O-sulfates facilitate 1,3-O/O-diaxial interactions better than ester groups and in particular benzoates. Also, sulfated 1,5-anhydro-D-glucitol occurred as a conformational mixture, the influence of the anomeric effect may thus have been overestimated in the previous discussion of this conformational effect.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	Q Science > QD Chemistry
Publisher:	Taylor & Francis
ISSN:	0732-8303
Date of Acceptance:	29 August 2001
Last Modified:	31 Jan 2020 04:15
URI:	https://orca.cardiff.ac.uk/id/eprint/96507

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