N-dithiasuccinoyl protectinggroup was easy to remove by thiolysis using 2-sulfanylethanol or dithiothreitol or reductively using sodium boranuide, thus affording, after N-acetylation, the corresponding N-acetyl-β-D-glucosamine glycosides. It has been demonstrated that it is possible to reduce the Dtsgroup in the presence of an azido group selectively by sodium boranuide or the Dts- and the azido group simultaneously
Pentafluorophenyl esters for temporary carboxyl group protection in solid phase synthesis of N-linked glycopeptides.
作者:Morten Meldal、Klaus Book
DOI:10.1016/s0040-4039(00)97223-x
日期:1990.1
with Fmoc-Asp(Cl)-O-Pfp (5) prepared from the readily available Fmoc-Asp(O-tBu)-O-Pfp (4). The resulting Fmoc-Asn(Ac3GlcNAcβ1-N-)-O-Pfp (6) was used as a building block in the solidphasesynthesis of an 11 residue glycopeptide fragment of the enzyme glucoamylase (AMG).
CSF114(Glc) is the first synthetic Multiple Sclerosis Antigenic Probe able to identify autoantibodies in a statistically significant number of Multiple Sclerosis patients. The P-turn conformation of this glucopeptide is fundamental for a correct presentation of the epitope Asn(Glc). To verify the influence of sugar mimics in antibody recognition in Multiple Sclerosis, we synthesized Fmoc-protected Asn derivatives containing alkaloid-type sugar mimics. The corresponding glycomimetics-containing peptide derivatives of the CSF114-type sequence were tested in competitive and solid-phase non-competitive ELISA on Multiple Sclerosis patients' sera. (C) 2007 Elsevier Ltd. All rights reserved.