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Abstract:

The oxidation of per-O-acetyl S-(1→3)- and S-(1→4)-linked thiodisaccharides containing glucose, gulose and galactose residues with an excess of m-chloroperbenzoic acid gave the corresponding sulfoxides or sulfones. Sulfones were formed when the oxidation reaction was left for longer times. The sulfoxides were obtained as diastereomeric mixtures due to the chirality of the sulfur atom. Both diastereoisomers of the S-(1→3)-linked thiodisaccharide sulfoxides were isolated by column chromatography, whereas the S-(1→4)-linked analogues could not be separated. The absolute configuration of the sulfur stereocentre of the sulfoxides was assigned using NMR spectroscopy, taking into account the preferred conformations of the molecules, and the shielding/deshielding of proton signals caused by the anisotropy of the S=O bond and related effects. Most of the thiodisaccharide sulfoxides were successfully O-deacetylated with MeOH/Et3N/H2O, but the sulfones underwent elimination reactions under these conditions. Therefore, the oxidation was performed on unprotected thiodisaccharides, and the corresponding sulfones were obtained in very good yields. Thiodisaccharides with (1→3) or (1→4) linkages, and with glucose or galactose at the non-reducing end, were oxidized with m-chloroperbenzoic acid to give the corresponding sulfoxides or sulfones. The configuration of the sulfur stereocentre of the sulfoxides was assigned using NMR spectroscopy, based on the anisotropy of the S=O bond and related effects. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Registro:

Documento: Artículo
Título:Synthesis of thiodisaccharide sulfoxides and sulfones - Determination of the configuration of the sulfur stereocentre
Autor:Colomer, J.P.; Manzano, V.E.; Varela, O.
Filiación:Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Ciudad de Buenos Aires, Argentina
Palabras clave:Carbohydrates; Configuration determination; Glycoconjugates; Sulfones; Sulfoxides
Año:2013
Número:32
Página de inicio:7343
Página de fin:7353
DOI: http://dx.doi.org/10.1002/ejoc.201301037
Título revista:European Journal of Organic Chemistry
Título revista abreviado:Eur. J. Org. Chem.
ISSN:1434193X
CODEN:EJOCF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1434193X_v_n32_p7343_Colomer

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Citas:

---------- APA ----------
Colomer, J.P., Manzano, V.E. & Varela, O. (2013) . Synthesis of thiodisaccharide sulfoxides and sulfones - Determination of the configuration of the sulfur stereocentre. European Journal of Organic Chemistry(32), 7343-7353.
http://dx.doi.org/10.1002/ejoc.201301037
---------- CHICAGO ----------
Colomer, J.P., Manzano, V.E., Varela, O. "Synthesis of thiodisaccharide sulfoxides and sulfones - Determination of the configuration of the sulfur stereocentre" . European Journal of Organic Chemistry, no. 32 (2013) : 7343-7353.
http://dx.doi.org/10.1002/ejoc.201301037
---------- MLA ----------
Colomer, J.P., Manzano, V.E., Varela, O. "Synthesis of thiodisaccharide sulfoxides and sulfones - Determination of the configuration of the sulfur stereocentre" . European Journal of Organic Chemistry, no. 32, 2013, pp. 7343-7353.
http://dx.doi.org/10.1002/ejoc.201301037
---------- VANCOUVER ----------
Colomer, J.P., Manzano, V.E., Varela, O. Synthesis of thiodisaccharide sulfoxides and sulfones - Determination of the configuration of the sulfur stereocentre. Eur. J. Org. Chem. 2013(32):7343-7353.
http://dx.doi.org/10.1002/ejoc.201301037