Chiral Recognition of Carboxylates by a Static Library of Thiourea Receptors with Amino Acid Arms
摘要:
Chiral recognition is based on a large network of very subtle interactions whose outcome is difficult to predict. A combinatorial approach is therefore the most suitable to search for the most efficient receptor and obtain a structure-enantioselectivity correlation. We synthesized a set of 12 receptors constructed with 1,9-diaminoantracene and alpha-amino acid esters, linked via thiourea groups. The association constants and enantioselectivities for the complexes with mandelate and N-acetylphenylalanine were determined by competitive NMR titrations. Association constants quite regularly depend on the substituents in the receptor structure, but the distribution of enantioselectivities across the library could not easily be rationalized.
Chiral Recognition of Carboxylates by a Static Library of Thiourea Receptors with Amino Acid Arms
摘要:
Chiral recognition is based on a large network of very subtle interactions whose outcome is difficult to predict. A combinatorial approach is therefore the most suitable to search for the most efficient receptor and obtain a structure-enantioselectivity correlation. We synthesized a set of 12 receptors constructed with 1,9-diaminoantracene and alpha-amino acid esters, linked via thiourea groups. The association constants and enantioselectivities for the complexes with mandelate and N-acetylphenylalanine were determined by competitive NMR titrations. Association constants quite regularly depend on the substituents in the receptor structure, but the distribution of enantioselectivities across the library could not easily be rationalized.
Enantioselective recognition of sodium carboxylates by an 1,8-diaminoanthracene based ion pair receptor containing amino acid units
作者:Paulina Cios、Jan Romański
DOI:10.1016/j.tetlet.2016.07.053
日期:2016.8
An anthracene based ion pair receptor containing two amino acid units supported by cation and anion binding domains has been synthesized and shown to exhibit enhanced anion binding affinities in the presence of sodium cations. The receptor’s ability to recognize enantiomers was studied using chiral carboxylates derived from 2-phenylbutyric acid, mandelic acid, and three Boc-protected amino acids. Sodium
A novel methodology for the evaluation of receptor arrangement in structurally flexible anion chemosensors was developed and applied to map the binding site of a new pseudocyclic tristhiourea chemosensor ( 6). The syntheses of 6 and related macrocyclic chemosensor 10 ( a model of the folded monomeric structure of 6) are reported. Both chemosensors were evaluated by titration with a variety of structurally different anions in CH3Cl and DMSO, showing a common preference for F-, CH3CO2-, and H2PO4-. However, within this group of anions, the binding patterns of the chemosensors differed, indicating dissimilarity in the arrangement of the binding sites of 6 and 10.
Chiral Recognition of Carboxylates by a Static Library of Thiourea Receptors with Amino Acid Arms
作者:Filip Ulatowski、Janusz Jurczak
DOI:10.1021/acs.joc.5b00403
日期:2015.5.1
Chiral recognition is based on a large network of very subtle interactions whose outcome is difficult to predict. A combinatorial approach is therefore the most suitable to search for the most efficient receptor and obtain a structure-enantioselectivity correlation. We synthesized a set of 12 receptors constructed with 1,9-diaminoantracene and alpha-amino acid esters, linked via thiourea groups. The association constants and enantioselectivities for the complexes with mandelate and N-acetylphenylalanine were determined by competitive NMR titrations. Association constants quite regularly depend on the substituents in the receptor structure, but the distribution of enantioselectivities across the library could not easily be rationalized.