(Thio)ureido Anion Receptors Based on a 1,3-Alternate Oxacalix[2]arene[2]pyrimidine Scaffold
作者:Wim Van Rossom、Jef Caers、Koen Robeyns、Luc Van Meervelt、Wouter Maes、Wim Dehaen
DOI:10.1021/jo300004p
日期:2012.3.16
In pursuit of highly preorganized macrocyclic host molecules for the complexation of anions, a series of oxacalix[2]arene[2]pyrimidine-based bis(thio)ureido receptors were synthesized and fully characterized. The pincer-like 1,3-alternate conformation of the oxacalix[4]arene scaffold, essential for an efficient host–guest interaction, was visualized by single-crystal X-ray analysis and supported by
为了追求高度预组织的阴离子络合的大环主体分子,合成了一系列草酸[2]亚芳基[2]嘧啶类双(硫)脲基受体,并进行了充分表征。oxacalix [4]芳烃骨架的钳状1,3-交替构象,对于有效的宿主-客体相互作用必不可少,通过单晶X射线分析得以显现,并得到了变温NMR研究的支持。通过1 H NMR滴定实验评估了受体的阴离子结合特性,显示了与H 2 PO 4 –,AcO –,BzO –和Cl –的分子间相互作用。离子。在具有强烈竞争性的DMSO / 0.5%H 2 O的溶剂混合物中,在Bisurea结合口袋上带有4-硝基苯基取代基的主体分子显示缔合常数在200–400 M –1范围内。