1022927-61-2Relevant academic research and scientific papers
Conformational domino effect in saccharides. 2. Anomeric configuration control
Roen, Alfredo,Mayato, Carlos,Padron, Juan I.,Vazquez, Jesus T.
, p. 7266 - 7279 (2008)
(Chemical Equation Presented) A series of alkyl β-D-glucopyranosyl- (1→6)-α-D-glucopyranosides were synthesized and analyzed by NMR and CD techniques. As in their β-anomer series, the rotational populations of the hydroxymethyl group involved in the interglycosidic linkage (torsion angle ω) are shown to depend on the aglycon and the solvent. However, for this α-anomer series the rotational dependence arises directly from steric effects. Correlations between rotational populations and molar refractivity (MR) steric parameters, but not Taft's steric parameters (β-anomers), of the alkyl substituents were observed. The conformational domino effect previously predicted from alkyl β-(1→6)-diglucopyranosides is now supported by the conformational properties of their α-anomers, the anomeric configuration controlling the domino effect. In addition, the rotational populations around the C5′-C6′ bond (torsion angle ω′) depend weakly on the structure of the aglycon and the anomeric configuration.
Conformational domino effect in saccharides: A prediction from alkyl β-(1→6)-diglucopyranosides
Roen, Alfredo,Padron, Juan I.,Mayato, Carlos,Vazquez, Jesus T.
, p. 3351 - 3363 (2008/09/20)
(Chemical Equation Presented) A series of alkyl β-D-glucopyranosyl- (1→6)-β-D-glucopyranosides, containing nonchiral and chiral aglycons, were synthesized and analyzed by NMR and CD. The results, collected from four sets of disaccharides, demonstrated that the rotational properties of the interglycosidic linkage depend on the structural natures of both the aglycon and the solvent. Stereoelectronic and steric factors explain this rotational dependence, the gauche-trans (gt) rotamer being the most stable. Furthermore, correlations between Taft's steric parameters or between the pKa values of the alkyl substituent (aglycon) versus corresponding rotamer populations were observed. These results point to a natural conformational domino effect in oligosaccharides, where the conformational properties of each (1→6) interglycosidic linkage will depend on the structure of the previous residue or its aglycon. In addition, a very weak rotational population dependence of the hydroxymethyl group at residue II on the aglycon at residue I was observed. The population of the gauche-gauche (gg) rotamer decreased, and that of gt increased as the Taft's steric parameters of the remote aglycon increased, independently of the disaccharide series and of the solvent.
