Chelidamic acid derivatives: Precursors to functionalized pyridyl cryptands & functionalized metal ligands
作者:Harry W. Gibson、Terry L. Price、Adam M.-P. Pederson、Zhenbin Niu、Pothanagandhi Nellipalli
DOI:10.1016/j.tet.2021.132333
日期:2021.8
materials, functionalization is required; in this article we describe syntheses of 23 new chelidamic acid (2,6-dicarboxy-4-hydroxypyridine, 5) derivatives that can be used to prepare functional pyridyl cryptands and functional metal ligands. The preparation and characterization of threenew functionalized pyridyl cryptands are also included.
吡啶基穴状配体,如12 - 16从吡啶-2,6-二羰基氯(形成4)和冠醚二醇7 - 11,已被证明是优异的紫精主机(N,N' -二烷基-4,4' -联吡啶鎓盐,2 ) K a值为~10 4至10 6 M -1,因此被认为是超分子系统的理想构件。然而,为了将这些宿主基序整合到有用的起始材料中,需要进行功能化;在本文中,我们描述了 23 种新螯合胺酸(2,6-二羧基-4-羟基吡啶,5 ) 可用于制备功能性吡啶基穴状配体和功能性金属配体的衍生物。还包括三个新的功能化吡啶基穴状配体的制备和表征。
Dendronized Molecular Knots: Selective Synthesis of Various Generations, Enantiomer Separation, Circular Dichroism
作者:Janosch Recker、Walter M. Müller、Ute Müller、Takateru Kubota、Yoshio Okamoto、Martin Nieger、Fritz Vögtle
Chiralpak type was used, in which the chiral component is covalently bonded to the silica gel support. The racemate splittings provide additional evidence for the knotted structure, as all other conceivable isomers such as macromonocyclic or catenated dodecaamides would not be chiral. The pure enantiomers obtained exhibit pronounced Cotton effects in their circular dichroism spectra. By comparison with the
Influence of the Solvent and Metal Center on Supramolecular Chirality Induction with Bisporphyrin Tweezer Receptors. Strong Metal Modulation of Effective Molarity Values
作者:Inmaculada C. Pintre、Simon Pierrefixe、Alex Hamilton、Virginia Valderrey、Carles Bo、Pablo Ballester
DOI:10.1021/ic202515v
日期:2012.4.16
We describe the synthesis of a bisporphyrin tweezerreceptor 1·H4 and its metalation with Zn(II) and Rh(III) cations. We report the thermodynamic characterization of the supramolecular chirality induction process that takes place when the metalated bisporphyrin receptors coordinate to enantiopure 1,2-diaminocyclohexane in twodifferent solvents, toluene and dichloromethane. We also performed a thorough
In the solid state, these doublehelices are stacked on top of each other to form long channels filled with water molecules. The 4-methoxy and 4-decyloxy-substituted analogues 1 and 3 have similar dimerization constants, showing that interactions between side chains are not significant between purely aliphatic residues. Consequently, the high stability of the doublehelices formed by 1 and 3 compared
使用收敛方法合成了一系列包含4-烷氧基取代的2,6-二氨基吡啶和2,6-吡啶-二羰基单元的七聚寡酰胺。通过溶液中的1 H NMR光谱在CDCl 3或DMSO- d 6中以各种浓度对这些化合物杂交成双螺旋二聚体进行了研究,并使用X射线晶体学分析以固态对其进行了研究。固态和溶液数据均表明这些化合物遵循相同的杂交方案。在CDCl 3中,其低聚物具有比其在2,6-二氨基吡啶单元上没有烷氧基取代基的相关化合物高得多的二聚常数(至多2000倍)。当4-烷氧基侧链存在于所有吡啶环上时,这种作用的起源可以部分解释为4-烷氧基侧链之间相互作用的结果。例如,4-苄氧基取代的低聚物2具有比4-癸氧基和4-甲氧基取代的类似物1和3更高的二聚化常数。2的晶体结构揭示了围绕双链体的各个角度的苄基侧链之间面对面和边缘面对面的多重芳族-芳族相互作用。在固态下,这些双螺旋彼此叠置以形成充满水分子的长通道。4-甲氧基和4-癸
Improved synthesis of functionalized mesogenic 2,6-bisbenzimidazolylpyridine ligands
作者:Blayne M. McKenzie、Adriane K. Miller、Rudy J. Wojtecki、J. Casey Johnson、Kelly A. Burke、Karis A. Tzeng、Patrick T. Mather、Stuart J. Rowan
DOI:10.1016/j.tet.2008.05.075
日期:2008.9
while facilitating scale up to multi-gram quantities in good yields (63–90%). The previous synthetic methodology was improved through judicious choice of the reducing agent and solvent in the reduction/ring-closing step. Via this platform, we also successfully accessed a mesogenic Bip ligand and herein report initial liquid crystalline properties of this derivative.