We describe the synthesis of N- and S-glycosides derived from D-galactopyranose in which the aglycon bears certain reactive groups. In a first series, the anomeric carbon is linked to an amino group that is acylated by a functionalized succinic acid chain. The terminal group of the aglycon moiety is a hydrazide function which can be converted by ultraviolet light irradiation into an azide and a nitrene. Alternatively, the terminal group is a diazoketone function which can be converted into a carbene, by ultraviolet light irradiation. A second series comprises glycosides of 1-thio-β-D-galactopyranose. The aglycon consists of a 6-carbon chain with a carboxylic end group. The latter has been converted into a hydrazide and diazoketone function. We show that the diazo group of the diazoketones (compounds 5 and 12) is susceptible to decomposition by ultraviolet irradiation, being nearly quantitatively decomposed after 3 minutes. These compounds add to a growing list of hexose derivatives which can be used in the field of photoaffinity-labeling of the sugar binding sites of certain lectins and of hexose transport systems, or to prepare modified proteins or ligands for affinity chromatography.
我们描述了从D-半乳糖合成N-和S-糖苷衍生物的过程,其中无糖原体带有某些反应基团。在第一系列中,缺氧糖原子与一个由功能化琥珀酸链酰化的氨基团相连接。无糖原体部分的末端基团是一个可以通过紫外光照射转化为偶氮和亚胺的肼基团。或者,末端基团是一个可以通过紫外光照射转化为碳烯的重氮酮基团。第二系列包括1-硫代-β-D-半乳糖苷。无糖原体由一个带有羧基末端的6碳链组成。后者已转化为肼基团和重氮酮基团。我们展示了重氮酮化合物(化合物5和12)的重氮基团对紫外辐射具有降解敏感性,在3分钟后几乎被完全分解。这些化合物加入了一个不断增长的葡萄糖衍生物清单,可以用于特定凝集素和葡萄糖转运系统的糖结合位点的光亲和标记,或用于制备亲和色谱的修饰蛋白质或配体。