Binding interactions between 3-aryl-1,2,4-oxadiazol-5-ones and a trisimidazoline base
作者:Anja Reichert、Roland Fröhlich、Roderick Ferguson、Arno Kraft
DOI:10.1039/b009451j
日期:——
The use of 1,2,4-oxadiazol-5-ones, a recently developed class of bioisosteric replacements for carboxylic acids in medicinal chemistry, as binding ligands in supramolecular complexes is reported and has been exemplified by the formation of non-covalent complexes between acidic 3-aryl-1,2,4-oxadiazol-5-ones and an imidazoline base, 1,3,5-tris(4,5-dihydroimidazol-2-yl)benzene 1. The X-ray crystal structure of complex 6d illustrates how the carbonyl oxygen and the nitrogen atom in the position α to the carbonyl group of the heterocyclic ligand are hydrogen-bonded to the NH groups of tris(imidazoline) 1. A combination of 1H NMR dilution studies and electrospray mass spectrometry-based competition experiments shows that 1,2,4-oxadiazol-5-ones bind more strongly to receptor 1 than a comparable benzoate.
报告了新近开发的一类生物等排取代物,即用于药物化学中的1,2,4-噁二唑-5-酮类化合物,作为超分子复合物中的结合配体,并通过酸性3-芳基-1,2,4-噁二唑-5-酮与咪唑啉碱,1,3,5-三(4,5-二氢咪唑-2-基)苯1之间非共价复合物的形成进行了实例说明。复合物6d的X射线晶体结构展示了杂环配体的羰基氧和羰基α位的氮原子如何与三(咪唑啉)1的NH基团形成氢键。结合1H NMR稀释研究和基于电喷雾质谱的竞争实验表明,1,2,4-噁二唑-5-酮与受体1的结合比相应的苯甲酸酯更紧密。