作者:Dimitri Ott、Joachim Seifert、Ingo Prahl、Mathäus Niemietz、Joanna Hoffman、Janna Guder、Manuel Mönnich、Carlo Unverzagt
DOI:10.1002/ejoc.201200468
日期:2012.9
A modular synthesis of complex-type N-glycans containing the core fucosyl motif was optimized. The core trisaccharide building block was protected by a methoxyphenyl group for convenient core fucosylation. The trisaccharide was obtained on a large scale from the glycosylation of the corresponding chitobiosyl azide with a glucosyl donor followed by intramolecular inversion. Improved methods were established
优化了包含核心岩藻糖基基序的复杂型 N-聚糖的模块化合成。核心三糖结构单元由甲氧基苯基保护,以方便核心岩藻糖基化。三糖是通过相应的壳二糖叠氮化物与葡萄糖基供体的糖基化,然后进行分子内转化而大规模获得的。建立了用于合成单糖结构单元及其偶联的改进方法。β-甘露糖苷的转化伴随着先前未注意到的副反应,导致亚氨基碳酸酯中间体的水解开环。通过两个区域选择性和立体选择性偶联,亚苄基保护的核心三糖被延长成双触角 N-聚糖七糖。最后的岩藻糖基化也产生了一些β端基异构体,