properties for carbohydrates of several artificial, acyclic receptors containing two or three heterocyclic recognition units covalently attached to a phenyl spacer is described. These host molecules having uncharged hydrogen-bonding sites were used in a systematic study towards the evaluation of recognition motifs for carbohydrates. A novel effective, acyclic hydrogen-bonding receptor possessing naphthyridine-amide
Simple receptors for the recognition and solubilisation of insoluble tartaric acid in chloroform were designed and synthesised for the first time. Receptors 2 and 3 were successful in solubilising tartaric acid into chloroform forming a 1:1 complex, and were also found to be useful as fluorescent probes for the detection of this substrate. (C) 2001 Elsevier Science Ltd. All rights reserved.
Molecular Recognition Studies on Naphthyridine Derivatives
作者:José Carlos Iglesias-Sánchez、Dolores Santa María、Rosa M. Claramunt、José Elguero
DOI:10.3390/molecules15031213
日期:——
The association constants Kb of three hosts I–III designed to have both enhanced hydrogen bonding donor strength and conformational preorganization with biotin analogues 1–5 are reported. 1H-NMR titrations under two different concentration conditions have been employed to determine the association constants Kb. A statistical analysis using a presence absence matrix has been applied to calculate the different contributions. Hydrogen bond interactions make naphthyridine derivatives II and III potent binders and effective receptors for (+)-biotin methyl ester (1), due to the complex stabilization by additional hydrogen bonds.
报告了设计用于增强氢键供体强度和构象预组织的生物素类似物 1-5 的三种宿主 I-III 的关联常数 Kb。采用两种不同浓度条件下的 1H-NMR 滴定法来确定关联常数 Kb。使用存在缺失矩阵进行统计分析,计算出不同的贡献。氢键相互作用使萘啶衍生物 II 和 III 成为(+)-生物素甲酯 (1) 的强效结合剂和有效受体,这是因为额外的氢键使复合物稳定。
Molecular recognition: A simple dinaphthyridine receptor for urea
作者:Shyamaprosad Goswami、Rakhi Mukherjee
DOI:10.1016/s0040-4039(97)00103-2
日期:1997.3
A new dinaphthyridine receptor 1 is designed that efficiently binds to urea probably by six hydrogen bonds forming a chloroform soluble 1:1 complex and selectively extracts urea into chloroform from its mixture with thiourea. The receptor 1 has fifteen fold higher binding constant for urea than the truncated receptor 2 possibly due to formation of greater number of hydrogen bonds in complexation.