Abstract
Attachment of Fmoc-asparagine or glutamine to p-alkoxybenzyl alcohol type resins has always been difficult and not very effective. A very simple and effective method for the preparation of peptides terminating in asparagine or glutamine is described. The method involves quantitative attachment of Fmoc-Asp-OtBu or Fmoc-Glu-OtBu via their side-chain carboxyl group to a resin functionalized with our TMBPA linker for peptide amides. Peptide synthesis is performed using our standard Fmoc chemistry, and treatment with acid, e.g. TFA/DCM/scavenger mixtures, releases the Asn or Gln peptides.
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