Details

Autor(en) / Beteiligte

• Lipták, András
• Lázár, László
• Borbás, Anikó
• Antus, Sándor

Titel

Reactions of phenyl and ethyl 2-O-sulfonyl-1-thio-α-d-manno- and β-d-glucopyranosides with thionucleophiles

Ist Teil von

• Carbohydrate research, 2009-12, Vol.344 (18), p.2461-2467

Ort / Verlag

Netherlands: Elsevier Ltd

Erscheinungsjahr

2009

Quelle

MEDLINE

Beschreibungen/Notizen

• Persubstituted derivatives of phenyl and ethyl 2-O-sulfonyl-1-thio-α-d-manno- and β-d-glucopyranosides were synthesized and reacted either with PhSNa or with MeSNa. The phenyl-1-thio compounds afforded the dithio-1,2-cis-axial/equatorial-α-d-glucopyranosides or dithio-1,2-cis-equatorial/axial-β-d-mannopyranosides by means of SN2 type of reactions. Starting from the ethyl-1-thio derivatives intramolecular 1,2-thio-migration took place predominantly. In the case of mannosides both nucleophilic reagents facilitate the formation of 1-SPh- or 1-SEt glycals by elimination. The formation of unsubstituted glycal could also be observed from the ethyl-1-thio derivatives, especially by using PhSNa as a nucleophile. The 1,2-dithio-glycosides are glycosyl donors affording 1,2-trans-2-thio-glycosides.