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Letters in Organic Chemistry

Editor-in-Chief

ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

Research Article

Exploring the Neighbouring Group Participatory Mechanism in Glycosylation Reaction

Author(s): Kamlesh Sharma*

Volume 17, Issue 11, 2020

Page: [872 - 876] Pages: 5

DOI: 10.2174/1570178617666200225104704

Price: $65

Abstract

Glycosyl donors have been experimentally shown to have a high tendency for acyl transfer to the alcohol nucleophile as a major side product during glycosylation reactions. Therefore, a neighbouring group participatory mechanism of glycosylation is explored using D-galactopyranose based donor having 2-O-acyl functionality by employing density functional theory. The reaction proceeds via galactopyranosyl dioxolenium ion as a stable intermediate, which leads to the formation of α-glycoside 4, orthoester (5 or 6) and acyl transfer 7 as side products. The mechanism of the stereoselective formation of β-glycoside is investigated. Moreover, all the possible intermediates and transition states have been explored.

Keywords: Selective glycosylation, Density functional theory, Glycosyl donor, Dioxolenium ion, Glycoside.

Graphical Abstract
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