Copper(ii)-catalyzed stereoselective 1,2-addition vs. Ferrier glycosylation of "armed" and "disarmed" glycal donors

Selective activation of "armed' and ''disarmed" glycal donors enabling the stereo-controlled glycosylations by employing Cu(ii)-catalyst as the promoter has been realized. The distinctive stereochemical outcome in the process is mainly influenced by the presence of diverse p...

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Bibliographic Details
Published in:Organic & biomolecular chemistry 2020-07, Vol.18 (25), p.4848-4862
Main Authors: Kumar, Manoj, Reddy, Thurpu Raghavender, Gurawa, Aakanksha, Kashyap, Sudhir
Format: Article
Language:English
Subjects:
Aglycones
Amino acids
Carbohydrates
Catalysts
Copper
Copper compounds
Deuteration
Donors (electronic)
Glycoconjugates
Glycosides
Glycosylation
Natural products
Oligosaccharides
Protecting groups
Selectivity
Stereoselectivity
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Summary:Selective activation of "armed' and ''disarmed" glycal donors enabling the stereo-controlled glycosylations by employing Cu(ii)-catalyst as the promoter has been realized. The distinctive stereochemical outcome in the process is mainly influenced by the presence of diverse protecting groups on the donor and the solvent system employed. The protocol is compatible with a variety of aglycones including carbohydrates, amino acids, and natural products to access deoxy-glycosides and glycoconjugates with high α-anomeric selectivity. Notably, the synthetic practicality of the method is amply verified for the stereoselective assembling of trisaccharides comprising 2-deoxy components. Mechanistic studies involving deuterated experiments validate the syn-diastereoselective 1,2-addition of acceptors on the double bond of armed donors.
ISSN:1477-0520
1477-0539
DOI:10.1039/d0ob01042a