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Volumn 132, Issue 13, 2010, Pages 4641-4652

Amide Cis-trans isomerization in aqueous solutions of methyl N -Formyl- d -glucosaminides and Methyl N -Acetyl- d -glucosaminides: Chemical equilibria and exchange kinetics

Author keywords

[No Author keywords available]

Indexed keywords

2-DEOXY-2; ACETAMIDO; ACTIVATION PARAMETER; AMINO SUGAR; ANOMERIC CONFIGURATION; ANOMERICS; ANOMERS; AQUEOUS SOLUTIONS; BIOLOGICAL PROPERTIES; BOND ROTATIONS; CHEMICAL EQUILIBRIUMS; CIS-TRANS; CIS-TRANS ISOMERIZATION; DFT CALCULATION; EXCHANGE KINETICS; GLUCOPYRANOSIDE; INTERCONVERSIONS; NMR SPECTROSCOPY; SATURATION TRANSFER; SIDE CHAINS; SOLUTION TEMPERATURE; SPIN-COUPLING; TEMPERATURE RANGE; TEMPERATURE STUDY; THERMODYNAMIC PARAMETER;

EID: 77950804843     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja9086787     Document Type: Article
Times cited : (44)

References (55)
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    • Two arguments have been offered to explain the predominant α-anomeric configuration of GlcNAc in aqueous solution. The first invokes a dipole-dipole interaction between the C1-O1 and the amide C - O bonds that is minimized in the α-pyranose. (34b) The second invokes hydrogen-bonding between the amide NAc side chain hydrogen and O1 as a means of preferentially stabilizing the α-pyranose (cis -fused five-membered ring). (34a) Both arguments presume an approximate α- anti /β- trans conformation of the NAc side chain in GlcNAc
    • Neuberger, A. and Fletcher, A. P. Carbohydr. Res. 1971, 17, 79 - 88 Two arguments have been offered to explain the predominant α-anomeric configuration of GlcNAc in aqueous solution. The first invokes a dipole-dipole interaction between the C1-O1 and the amide C - O bonds that is minimized in the α-pyranose. (34b) The second invokes hydrogen-bonding between the amide NAc side chain hydrogen and O1 as a means of preferentially stabilizing the α-pyranose (cis -fused five-membered ring). (34a) Both arguments presume an approximate α- anti /β- trans conformation of the NAc side chain in GlcNAc.
    • (1971) Carbohydr. Res. , vol.17 , pp. 79-88
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    • (1995) Physical Organic Chemistry , pp. 350
    • Isaacs, N.1
  • 52
    • 77950825670 scopus 로고    scopus 로고
    • This survey was conducted on 1311 pdb files (from the RCSB PDB database) containing a total of 7994 GlcNAc residues. Within the latter group, 917 residues contained a H2-C2-N2-H torsion angle between 60° and -60°, producing an -11% α- syn population; the remaining -89% is α- trans. More pertinent to the present work, 463 residues contained a C2-N2-C1-C2 torsion angle between 60° and -60°, giving an -6% β- cis population
    • This survey was conducted on 1311 pdb files (from the RCSB PDB database) containing a total of 7994 GlcNAc residues. Within the latter group, 917 residues contained a H2-C2-N2-H torsion angle between 60° and -60°, producing an -11% α- syn population; the remaining -89% is α- trans. More pertinent to the present work, 463 residues contained a C2-N2-C1-C2 torsion angle between 60° and -60°, giving an -6% β- cis population.
  • 53
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    • Eliel and Wilen have suggested that the preference for trans amide conformations in solution is due to a combination of steric (attractive in trans, repulsive in cis) and charge interaction factors. See ref 44 for further discussion
    • Eliel and Wilen have suggested that the preference for trans amide conformations in solution is due to a combination of steric (attractive in trans, repulsive in cis) and charge interaction factors. See ref 44 for further discussion.
  • 55
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    • 6 solvent (Figure S4 in Supporting Information). For 2, nearly identical coupling magnitudes were observed in both amide conformations (9.6 Hz in β- cis; 9.5 Hz in β- trans), suggesting similar bond conformations about bond α. On the other hand, the effect of amide conformation on α is probably smaller for N -formyl than for N -acetyl substituents. At present, similar J -coupling measurements have not been attempted in MeGlcNAc anomers because of the considerably less intense cis signals
    • 6 solvent (Figure S4 in Supporting Information). For 2, nearly identical coupling magnitudes were observed in both amide conformations (9.6 Hz in β- cis; 9.5 Hz in β- trans), suggesting similar bond conformations about bond α. On the other hand, the effect of amide conformation on α is probably smaller for N -formyl than for N -acetyl substituents. At present, similar J -coupling measurements have not been attempted in MeGlcNAc anomers because of the considerably less intense cis signals.


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