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Stereoselective palladium-catalyzed O-glycosylation using glycals.
J Am Chem Soc. 2004 Feb 11; 126(5):1336-7.JA

Abstract

A highly stereoselective palladium-catalyzed O-glycosylation reaction is described. The reaction of a glycal 3-acetate or carbonate with the zinc(II) alkoxide of acceptors establishes the glycosidic linkage under palladium catalysis to give rise to disaccharides as the product in good yields and with high stereoselectivity. In contrast to the Lewis acid mediated Ferrier procedure, the anomeric stereochemistry of this reaction is controlled by the employed ligand. Whereas the use of a complex of palladium acetate and 2-di(tert-butyl)phosphinobiphenyl as the catalyst results in the exclusive beta-glycoside formation, the same reaction using trimethyl phosphite ligand furnishes an alpha-anomer as the major product. The utility of the 2,3-unsaturation present in the resulting glycoside is demonstrated by the further transformations such as dihydroxylation, hydration, and hydrogenation reactions. Thus, the combination of the glycosylation and subsequent functionalization provides a novel entry to saccharides which are otherwise difficult to prepare. The broad scope of the process, mildness of the reaction conditions, and experimental simplicity should make this method a useful tool in synthetic carbohydrate chemistry.

Authors+Show Affiliations

Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

14759180

Citation

Kim, Hahn, et al. "Stereoselective Palladium-catalyzed O-glycosylation Using Glycals." Journal of the American Chemical Society, vol. 126, no. 5, 2004, pp. 1336-7.
Kim H, Men H, Lee C. Stereoselective palladium-catalyzed O-glycosylation using glycals. J Am Chem Soc. 2004;126(5):1336-7.
Kim, H., Men, H., & Lee, C. (2004). Stereoselective palladium-catalyzed O-glycosylation using glycals. Journal of the American Chemical Society, 126(5), 1336-7.
Kim H, Men H, Lee C. Stereoselective Palladium-catalyzed O-glycosylation Using Glycals. J Am Chem Soc. 2004 Feb 11;126(5):1336-7. PubMed PMID: 14759180.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stereoselective palladium-catalyzed O-glycosylation using glycals. AU - Kim,Hahn, AU - Men,Hongbin, AU - Lee,Chulbom, PY - 2004/2/5/pubmed PY - 2004/5/20/medline PY - 2004/2/5/entrez SP - 1336 EP - 7 JF - Journal of the American Chemical Society JO - J. Am. Chem. Soc. VL - 126 IS - 5 N2 - A highly stereoselective palladium-catalyzed O-glycosylation reaction is described. The reaction of a glycal 3-acetate or carbonate with the zinc(II) alkoxide of acceptors establishes the glycosidic linkage under palladium catalysis to give rise to disaccharides as the product in good yields and with high stereoselectivity. In contrast to the Lewis acid mediated Ferrier procedure, the anomeric stereochemistry of this reaction is controlled by the employed ligand. Whereas the use of a complex of palladium acetate and 2-di(tert-butyl)phosphinobiphenyl as the catalyst results in the exclusive beta-glycoside formation, the same reaction using trimethyl phosphite ligand furnishes an alpha-anomer as the major product. The utility of the 2,3-unsaturation present in the resulting glycoside is demonstrated by the further transformations such as dihydroxylation, hydration, and hydrogenation reactions. Thus, the combination of the glycosylation and subsequent functionalization provides a novel entry to saccharides which are otherwise difficult to prepare. The broad scope of the process, mildness of the reaction conditions, and experimental simplicity should make this method a useful tool in synthetic carbohydrate chemistry. SN - 0002-7863 UR - https://www.unboundmedicine.com/medline/citation/14759180/Stereoselective_palladium_catalyzed_O_glycosylation_using_glycals_ L2 - https://dx.doi.org/10.1021/ja039746y DB - PRIME DP - Unbound Medicine ER -
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