FiveC-glycosyl functionalized lysine building blocks, featuringC-glycosidic derivatives of alpha-rhamnose, alpha-mannose, alpha-galactose, beta-galactose, and beta-N-acetyl glucosamine have been... Show moreFiveC-glycosyl functionalized lysine building blocks, featuringC-glycosidic derivatives of alpha-rhamnose, alpha-mannose, alpha-galactose, beta-galactose, and beta-N-acetyl glucosamine have been designed and synthesized. These derivatives, equipped with acid-labile protecting groups, are eminently suitable for solid-phase synthesis of multivalent glycopeptides. The lysine building blocks were prepared fromC-allyl glycosides that underwent a Grubbs cross-metathesis with an acrylate, followed by a reduction of the C=C double bond in the resulting alpha,beta-unsaturated esters, and liberation of the carboxylate to allow condensation with a lysine side chain. The thus obtainedC-glycosides, five in total, were applied in the solid-phase peptide synthesis (SPPS) of three glycopeptides, showing the potential of the described building blocks in the assembly of well-defined mimics of homo- and heteromultivalent glycopeptides and glycoclusters. Show less
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