ChemInform Abstract: Application of Serine- and Threonine-Derived Cyclic Sulfamidates for the Preparation of S-Linked Glycosyl Amino Acids in Solution- and Solid-Phase Peptide Synthesis.

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摘要：

Cyclic sulfamidates were synthesized in 60% yield from L-serine and allo-L-threonine, respectively. These sulfamidates reacted with a variety of unprotected 1-thio sugars in aqueous bicarbonate buffer (pH 8) to afford the corresponding S-linked serine- and threonine-glycosyl amino acids with good diastereoselectivity (> or =97%) after hydrolysis of the N-sulfates. The serine-derived sulfamidate was incorporated into a simple dipeptide to generate a reactive dipeptide substrate that underwent chemoselective ligation with a 1-thio sugar to afford an S-linked glycopeptide. This sulfamidate was also incorporated into a peptide on a solid support in conjunction with solid-phase peptide synthesis. Chemoselective ligation of a 1-thio sugar with the cyclic sulfamidate was achieved on the solid support, followed by removal of the N-sulfate. Finally, the peptide chain of the resulting support-bound S-linked glycopeptide was extended using standard peptide synthesis procedures.

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关键词：

amino acids, peptides carbohydrates solid‐phase synthesis glycosylation stereochemistry (general, optical resolution)

DOI：

10.1002/chin.200231210

被引量：

232

年份：

2002