The (2-Phenyl-2-trimethylsilyl)ethyl-(PTMSEL)-Linker in the Synthesis of Glycopeptide Partial Structures of Complex Cell Surface Glycoproteins
作者:Michael Wagner、Sebastian Dziadek、Horst Kunz
DOI:10.1002/chem.200305304
日期:2003.12.15
protected peptides and glycopeptides. Its cleavage is achieved under almost neutral conditions using tetrabutylammonium fluoride trihydrate in dichloromethane thus allowing the construction of complex molecules sensitive to basic and acidic media commonly required for the cleavage of standard linker systems. The advantages of the PTMSEL linker are demonstrated in the synthesis of glycopeptides from the liver
(2-苯基-2-三甲基甲硅烷基)乙基-(PTMSEL)接头代表一种新型的氟化物敏感锚,用于固相合成受保护的肽和糖肽。使用二氯甲烷中的三水合四丁基氟化铵在几乎中性的条件下进行裂解,因此可以构建对碱性和酸性介质敏感的复杂分子,而碱性和酸性介质通常是裂解标准接头系统所需的。PTMSEL接头的优势在肝肠(LI)-钙粘着蛋白和粘蛋白MUC1的糖肽合成中得到了证明,这些糖肽带有碳水化合物部分,例如N-连接的壳二糖或O-连接的唾液酸-T(N)-残基。这些类型的糖肽的合成是困难的,因为它们在固相上以及在完全脱保护的形式下易于形成二级结构。使用PTMSEL接头,可以根据Fmoc策略通过自动合成来访问这些分子,而无需经常观察到副反应,例如天冬酰胺或二酮哌嗪的形成。