A novel method enabling the synthesis of receptors based on the calix[4]arenes immobilized in the partial cone conformation is reported. The application of a protection/deprotection strategy using nosyl groups enables the regioselective introduction of functional groups (NO2 and NH2) into the upper rim of calix[4]arenes, leading finally to the substitution pattern so far inaccessible to calixarene chemistry. The introduction of two ureido functions at the para positions of the partial cone conformer yields a novel type of receptor which can bind anions even in a highly competitive solvent (DMSO). This revealed that the partial cone conformation, so far rather ignored in supramolecular chemistry, can be also very useful in design of novel anion receptors.
报道了一种基于固定在部分锥体构象中的杯[4]
芳烃合成受体的新方法。使用nosyl基团的保护/脱保护策略的应用使得能够将官能团(
NO2和NH2)区域选择性地引入到杯[4]
芳烃的上边缘,最终导致迄今为止杯
芳烃化学无法达到的取代模式。在部分锥体构象异构体的对位引入两个
脲基官能团产生了一种新型受体,即使在高度竞争性溶剂(
DMSO)中也可以结合阴离子。这表明,迄今为止在超分子
化学中被忽视的部分圆锥构象在新型阴离子受体的设计中也非常有用。