Efficient Synthesis of S-Linked Glycopeptides in Aqueous Solution by a Convergent Strategy
作者:Xiangming Zhu、Richard R. Schmidt
DOI:10.1002/chem.200305163
日期:2004.2.20
In naturally occurring glycopeptides and glycoproteins the glycan residues generally possess N- and O-linkages to the peptide backbone. Here we report the synthesis of the corresponding S-linked glycopeptides by a convergent strategy to provide compounds which should be quite stable to glycosidases. To this end, peptides that contain beta-bromoalanine and gamma-bromohomoalanine were generated either
在天然存在的糖肽和糖蛋白中,聚糖残基通常具有与肽主链的N-和O-键。在这里,我们报告了通过收敛策略合成相应的S-连接糖肽,以提供对糖苷酶应相当稳定的化合物。为此,分别通过丝氨酸和高丝氨酸残基的溴化或通过相应氨基酸的标准连接直接产生含有β-溴丙氨酸和γ-溴高丙氨酸的肽。通过已知方法制备了O-乙酰基保护的GalNAc,GlcNAc和乳糖的1-硫代糖。在含有TBAHS和NaHCO(3)的乙酸乙酯/水两相系统中,或在由DMF /水组成且含有NaHCO(3)的单相系统中,硫糖与这些肽的反应,可以干净,几乎定量地得到所需的S-连接糖肽。该反应对于O-未保护的1-硫代糖也很好地起作用。