Selective Binding of <i>cis</i>-1,3,5-Cyclohexane Tricarboxylic Acid vs Its Epimeric <i>trans </i>Isomer by a Tripodal Amidopyridine Receptor; Crystal Structures of the 1:1 Complexes
                                
                                    
                                        作者:Pablo Ballester、Magdalena Capó、Antoni Costa、Pere M. Deyà、Rosa Gomila、Andreas Decken、Ghislain Deslongchamps                                    
                                    
                                        DOI:10.1021/ol0069148
                                    
                                    
                                        日期:2001.1.1
                                    
                                    [GRAPHICS]A tripodal tris-amidopyridine receptor forms a 1:1 complex with trans-1,3,5-cyclohexane tricarboxylic acid that is 1 order of magnitude less stable than the one formed with the corresponding cis-triacid epimer, The X-ray crystal structures of the complexes have been determined, confirming the binding geometry derived from NMR data in solution and force field calculations, and its geometrical features are used to explain the observed selectivity.