Journal article
Synthesis of Glucuronoxylan Hexasaccharides by Preactivation-Based Glycosylations : Synthesis of Glucuronoxylan Hexasaccharides by Preactivation-Based Glycosylations
The synthesis of two glucuronoxylans is described, which both consist of a pentaxylan backbone and a glucuronic acid linked to the 2 position in the fourth xylose residue from the reducing end. The two target molecules differ in the 4 position of the glucuronic acid where one is unsubstituted while the other contains a methyl ether.
The pentaxylan backbone is assembled in four glycosylation reactions with phenyl thioglycoside donors. The couplings are performed by preactivation of the donor with in situ‐generated p ‐nitrobenzenesulfenyl triflate prior to addition of the acceptor. The glucuronic acids are then attached by Koenigs‐Knorr glycosylations followed by deprotections.
The syntheses employ a total of 8 steps from monosaccharide building blocks and afford the two glucuronoxylans in 12 and 15% overall yield. The hexasaccharide products are valuable substrates for investigating the activity and specificity of glucuronoxylan‐degrading enzymes.
Language: | English |
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Year: | 2020 |
Pages: | 3050-3058 |
ISSN: | 10990690 and 1434193x |
Types: | Journal article |
DOI: | 10.1002/ejoc.202000211 |
ORCIDs: | Madsen, Robert |