Four novel calix[4]arene-based glycoclusters were synthesized by conjugating the saccharide units to the macrocyclic scaffold using the CuAAC reaction and using long and hydrophilic ethylene glycol spacers. Initially, two galactosylcalix[4]arenes were prepared starting from saccharide units and calixarene cores which differ in the relative dispositions of the alkyne and azido groups. Once the most convenient synthetic pathway was selected, two further lactosylcalix[4]arenes were obtained, one in the cone, the other one in the 1,3-alternate structure. Preliminary studies of the interactions of these novel glycocalixarenes with galectin-3 were carried out by using a lectin-functionalized chip and surface plasmon resonance. These studies indicate a higher affinity of lactosyl- over galactosylcalixarenes. Furthermore, we confirmed that in case of this specific lectin binding the presentation of lactose units on a cone calixarene is highly preferred with respect to its isomeric form in the 1,3-alternate structure.
通过Cu
AAC反应,将糖基单元连接到大环支架上,使用长且亲
水的
乙二醇间隔物,合成了四种新型的
环糊精糖簇。最初,从糖基单元和
环糊精核心出发,制备了两种半
乳糖基
环糊精,它们在
炔烃和
叠氮基团的相对位置上有所不同。选择最便利的合成途径后,获得了另外两种
乳糖基
环糊精,一种是锥形结构,另一种是1,3-交替结构。通过使用具有凝集素功能的芯片和表面等离子共振技术,对这些新型糖基
环糊精与galectin-3的相互作用进行了初步研究。这些研究表明,
乳糖基
环糊精比半
乳糖基
环糊精具有更高的亲和力。此外,我们证实,在这种特定凝集素结合的情况下,将
乳糖单元呈现在锥形
环糊精上比其在1,3-交替结构的同分异构体更受青睐。