Complete tetraglycosylation of a calix[4]arene by a chemo-enzymatic approach

Literature Information

Publication Date 2017-11-15
DOI 10.1039/C7OB02448G
Impact Factor 3.876
Authors

Silvia Bernardi, Dong Yi, Ning He, Alessandro Casnati, Wolf-Dieter Fessner, Francesco Sansone


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Abstract

Polyglycosylated calixarenes are efficient and selective multivalent ligands for lectins. However, the chemical decoration of these macrocyclic scaffolds with saccharides of increasing complexity is hampered by the highly complex chemistry of carbohydrates. An alternative to the conventional approach is the enzymatic diversification of simple glycocluster-presented glycans. In this work, we present a highly efficient chemo-enzymatic approach to tetra-N-acetyl-lactosaminylcalix[4]arene via glycan extension catalyzed by a human β-1,4-galactosyltransferase. This demonstrates that calixarenes can be exhaustively processed by enzymatic glycosyl transfer despite the heavy steric crowding, paving the way to the design and achievement of multivalent ligands based on these macrocyclic scaffolds having complex branched glycans.

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Organic & Biomolecular Chemistry

Organic & Biomolecular Chemistry
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