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
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
Combination of silyl carbamate and amino acid fluoride for solid-phase peptide synthesis
作者:Kimitoshi Sakamoto、Yoshiaki Nakahara、Yukishige Ito
DOI:10.1016/s0040-4039(02)00050-3
日期:2002.2
formation is an often encountered side reaction in the synthesis of peptide having C-terminal proline ester. A novel strategy for the avoidance of this side reaction was developed, which utilizes Pfp ester of Tsoc-amino acid and Fmoc-amino acidfluoride as the second and the third aminoacid, respectively. This strategy was applied to the synthesis of 37–53 fragment of the β-chain of human chorionic gonadotropin