condensation on a solid support. In order to facilitate detachment of the protected glycopeptides from the resin, a new allyl ester type of linker, which is cleavable by Pd(O)-catalysis, was designed and used in combination with the commercial acid-labile Sieber amide resin for the solid-phasesynthesis. Glycopeptide blocks consisting of [O-(2,3,4-tri-O-acetyl-D-xylosyl)-L-seryl-L-glycine]n (n = 1 - 8) were produced
t-Butyl 6-bromo-(E)-4-hexenoate was used as a handle for the solid-phasesynthesis of glycopeptides. The handle was first conjugated with Fmoc amino acids to form the allyl esters, which were then attached to the Sieber amide resin via acidic cleavage of the t-butyl esters followed by activation of the liberated carboxylic acids. Solid-phasesynthesis was demonstrated for the glycopeptide oligomers modeled