High α/β-Anomer Selectivity in Molecular Recognition of Carbohydrates by Artificial Receptors
摘要:
New effective, acyclic, pyridine-based receptors 1-3 show remarkable alpha/beta binding selectivity in the recognition of monosaccharides. They are able to participate in cooperative and bidentate hydrogen bonds with sugar hydroxyls as well as in CH-pi interactions with CH's of sugar molecules.
Carboxylate-Based Receptors for the Recognition of Carbohydrates in Organic and Aqueous Media
作者:Monika Mazik、Hüseyin Cavga
DOI:10.1021/jo052479p
日期:2006.4.1
Acyclic receptors containing neutral and ionic hydrogen-bonding sites, such as amino-pyridine and carboxylate groups, were prepared and their binding properties toward neutral sugar molecules were studied. The bindin g studies with disodium and bis(tetramethylammonium) salts containing the dianion 11 have revealed that this type of receptor molecule is able to recognize the selected sugars in both organic and aqueous media. The carboxylate/pyridine-based receptor 11 exhibits in chloroform at least a 100-fold higher affinity for glucopyranosides than the previously described triarmed pyridine-based receptor 1, incorporating only neutral hydrogen-bonding sites. A substantial drop in the association constants is expectedly observed for an ester analogue of 11, compound 9. The dicarboxylate 11 is able to form complexes in water with methyl P-D-glucopyranoside and D-cellobiose, with a preference for the disaccharide. The studies show the importance of charge-reinforced hydrogen bonds in the recognition of carbohydrates.
High α/β-Anomer Selectivity in Molecular Recognition of Carbohydrates by Artificial Receptors
作者:Monika Mazik、Wolfgang Radunz、Willi Sicking
DOI:10.1021/ol0201759
日期:2002.12.1
New effective, acyclic, pyridine-based receptors 1-3 show remarkable alpha/beta binding selectivity in the recognition of monosaccharides. They are able to participate in cooperative and bidentate hydrogen bonds with sugar hydroxyls as well as in CH-pi interactions with CH's of sugar molecules.