A disaccharide implicated in anchoring of bacterial Surface-layer proteins to secondary cell wall glycopolymers has been prepared by glycosylation of a protected N-acetyl glucosamine acceptor with a glucopyranosyl donor to generate the β-(14)-linkage. Subsequent inversion of the configuration and azide introduction at position 2 with triflic anhydride, however, led to formation of a tetrazole derivative
通过将受保护的
N-乙酰氨基葡萄糖受体与
吡喃
葡萄糖基供体进行糖基化以产生 β-(1→4)-键,已经制备了一种与细菌表面层蛋白锚定到次生细胞壁糖聚合物有关的二糖。然而,随后用
三氟甲磺酸酐反转构型和在 2 位引入
叠氮化物,导致形成
四唑衍
生物。或者,通过
叠氮化
钠、还原和 N-乙酰化置换 2O-
甲磺酸盐能够转化为远端 N-乙酰基-β-
甘露糖胺残基。后一个单元的
丙酮酸化和全局脱保护提供了来自类芽孢杆菌的
双糖重复单元作为晶体学和结合研究的
配体。