Exploring the Neighbouring Group Participatory Mechanism in Glycosylation Reaction

Author(s): Kamlesh Sharma*

Journal Name: Letters in Organic Chemistry

Volume 17 , Issue 11 , 2020

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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.

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Article Details

VOLUME: 17
ISSUE: 11
Year: 2020
Page: [872 - 876]
Pages: 5
DOI: 10.2174/1570178617666200225104704
Price: $95

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