作者:Neus Mesquida、Immaculada Dinarès、Anna Ibáñez、Ermitas Alcalde
DOI:10.1039/c3ob41214h
日期:——
Revisiting a ‘3 + 1’ convergent stepwise strategy permitted the synthesis of [14]imidazoliophane 2·2Br in excellent yield for a macrocyclization. The new [14]triazoliophane 3 and bis(1,2,3-triazolium) counterpart 4·2Cl were less synthetically accessible and the hybrid derivative 5·Cl proved troublesome to prepare. Triazolophane 3 was devoid of anion-binding affinities, while charged [14]heterophane prototypes showed a particular preference for acetate. When association constants were compared, dicationic systems 2·2PF6 and 4·2PF6 showed greater values than monocationic macrocycle 5·PF6, and the highest affinities corresponded to the bis(imidazolium) receptor 2·2PF6.
通过重新研究 "3 + 1 "收敛分步策略,我们合成了[14]咪唑啉 2-2Br,大环化收率极高。新的[14]三唑磷烷 3 和双(1,2,3-三唑鎓)对应物 4-2Cl 的合成不太容易,而且混合衍生物 5-Cl 的制备也很麻烦。三唑烷 3 不具有阴离子结合亲和力,而带电荷的 [14] 杂环烷原型对醋酸盐有特殊的偏好。在比较结合常数时,双阳离子系统 2-2PF6 和 4-2PF6 的结合常数高于单阳离子大环 5-PF6,而亲和力最高的是双咪唑受体 2-2PF6。