A series of rim-differentiated Co-pillar[4+1]arenes featuring penta-substituted “upper” rims and mono-functionalisable “lower” rims was successfully synthesised and fully characterised. These novel pillar[5]arene-based scaffolds with clickable moieties and extra synthetic handles are versatile platforms for self-assembled molecular architectures and biological applications.
Stereochemical Inversion of Rim-Differentiated Pillar[5]arene Molecular Swings
作者:Ke Du、Paul Demay-Drouhard、Kushal Samanta、Shunshun Li、Tushar Ulhas Thikekar、Haiying Wang、Minjie Guo、Barend van Lagen、Han Zuilhof、Andrew C.-H. Sue
DOI:10.1021/acs.joc.0c01464
日期:2020.9.4
To investigate the dynamic stereochemical inversion behavior of pillar[5]arenes (P[5]s) in more detail, we synthesized a series of novel rim-differentiated P[5]s with various substituents and examined their rapid rotations by variable-temperature NMR (203–298 K). These studies revealed for the first time the barrier of “methyl-through-the-annulus” rotation (ΔG‡ = 47.4 kJ·mol–1 in acetone) and indicated
Rim-differentiation vs. mixture of constitutional isomers: A binding study between pillar[5]arene-based glycoclusters and lectins from pathogenic bacteria
cycloaddition “click” reactions. Their bindingtowards therapeutically relevant bacteriallectins, such as LecA and LecB from Pseudomonas aeruginosa and concanavalin A (ConA), were evaluated subsequently by isothermal titration calorimetric studies. Most of these isomer-free RD-P[5] pentavalent glycoclusters, except the fucosylated ones, display good affinities to lectins. Nonetheless, the dissociation constants
作者:Minjie Guo、Xuemei Wang、Caihong Zhan、Paul Demay-Drouhard、Wenjiao Li、Ke Du、Mark A. Olson、Han Zuilhof、Andrew C.-H. Sue
DOI:10.1021/jacs.7b10767
日期:2018.1.10
synthetic protocol based on FeCl3-catalyzed cyclization of asymmetrically substituted 2,5-dialkoxybenzylalcohols. This yields an unprecedented 55% selectivity of the C5-symmetric tiara-like pillar[5]arene isomer among four constitutional isomers. Based on this new method, a series of functionalizable tiara-pillar[5]arene derivatives with C5-symmetry was successfully synthesized, isolated, and fully characterized