title: Sulfenic acids in the carbohydrate field. An example of straightforward access to novel multivalent thiosaccharides.
abstract: [reaction: see text] Both anomers of O-protected 1-thio-D-gluco- and -D-mannopyranoses were selected to provide the substrates for developing a smooth and general methodology that gives access to anomeric glycosulfoxides. The behavior of the corresponding beta-D-galactopyran derivatives was also investigated. 2-[1-[(2,3,4,6-Tetra-O-acetyl-beta-D-glucopyranosyl)sulfinyl](1-methyl)ethyl]malonic acid diethyl esters 4 were thermolyzed in refluxing dichloromethane for generating 2,3,4,6-tetra-O-acetyl-beta-D-glucopyranose-1-sulfenic acid (8), in the presence of 2-propynyl beta-d-glucopyranoside tetraacetate (32). The syn-addition of transient 8 onto the triple bond of 32 furnished 2-[(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl)sulfonyl]-2-propenyl beta-d-glucopyranoside tetraacetate (34), after m-CPBA oxidation of the corresponding sulfinyl epimeric mixture 33. This synthetic pathway appears particularly attractive since it represents an example of a mild and versatile approach to thiodisaccharides of foreseeably significant biological behavior. Various carbohydrate-derived sulfenic acids, different in glycosyl moiety and sulfenic function positioning, and various alkynylated carbohydrates can be adopted as combining units in the synthesis of alkene-linked multivalent thiosaccharides.
authors.affiliation: Dipartimento di Chimica Organica e Biologica, Università degli Studi di Messina, Salita Sperone 31 (vill. S. Agata), 98166 Messina, Italy.
authors.forename: Maria C
authors.initials: MC
authors.lastname: Aversa
authors.forename: Anna
authors.initials: A
authors.lastname: Barattucci
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Bilardo
authors.forename: Paola
authors.initials: P
authors.lastname: Bonaccorsi
authors.forename: Placido
authors.initials: P
authors.lastname: Giannetto
authors.forename: Patrick
authors.initials: P
authors.lastname: Rollin
authors.forename: Arnaud
authors.initials: A
authors.lastname: Tatibouët
mesh_terms: D002241:Carbohydrates / Q000138:chemical synthesis*; D013237:Stereoisomerism; D013434:Sulfenic Acids / Q000138:chemical synthesis*; D013454:Sulfoxides / Q000138:chemical synthesis
chemical_list: D002241:Carbohydrates; D013434:Sulfenic Acids; D013454:Sulfoxides