Azacalixarene: synthesis, conformational analysis, and recognition behavior toward anions
作者:Kenichi Niikura、Eric V. Anslyn
DOI:10.1039/a904607k
日期:——
The synthesis of an azacalix[4]arene (4) having four primary amino groups on the upper rim has been achieved. The synthesis was accomplished by a one-step cyclization starting from two easily synthesized building blocks. 1H NMR spectra indicate that this azacalixarene prefers a cone conformation, but that rapid interconversion among different conformations occurs at room temperature. It is shown that 4 is a useful receptor for sensing various anionic guests, such as inositol triphosphate (IP3), in aqueous solution. In a competition binding assay, fluorescent probes bound within 4 were replaced by anionic guests in buffered aqueous solution, causing a modulation in the fluorescence intensity. NMR spectra of 4 in the presence of fructose 1,6-diphosphate suggest that this guest is bound inside the cavity which adopts a cone conformation.
Systematic Dissection of an Aminopyrrolic Cage Receptor for β-Glucopyranosides Reveals the Essentials for Effective Recognition
作者:Oscar Francesconi、Matteo Gentili、Cristina Nativi、Ana Ardá、F. Javier Cañada、Jesús Jiménez-Barbero、Stefano Roelens
DOI:10.1002/chem.201400365
日期:2014.5.12
structures designed for the recognition of glucosides has been obtained by systematically destructuring a tripodal aminopyrroliccagereceptor that selectively recognizes octyl‐β‐D‐glucopyranoside (OctβGlc). NMR spectroscopy and isothermal titration calorimetry binding measurements showed that cleavage of one pillar of the cage was beneficial to the binding properties of the receptor, as long as two residual