Analysis of linkage positions in 2-acetamido-2-deoxy-d-glucopyranosyl residues by the reductive-cleavage method
作者:John A. Bennek、Michael J. Rice、Gary R. Gray
DOI:10.1016/0008-6215(86)85064-9
日期:1986.12
The fate of methylated 2-acetamido-2-deoxy-D-glucopyranosylresidues under reductive-cleavage conditions was investigated by using methyl 2-(acetylmethylamino)-2-deoxy-3,4,6-tri-O-methyl-beta-D-glucopyran oside (1), its alpha anomer (8), and fully methylated lacto-N-tetraitol as test compounds. Treatment of 1 with triethylsilane and trimethylsilyl trifluoromethanesulfonate in dichloromethane gave rise
A1H-NMR Spectroscopic Investigation of the Conformation of the Acetamido Group in Some Derivatives ofN-Acetyl-D-allosamine and -D-glucosamine
作者:Paul Fowler、Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.19960790127
日期:1996.2.7
The population of the conformations obtained by rotation around the C(2)N and the NC(O) bonds of AllNAc, GlcNAc, and GlcNMeAc derivatives was investigated by 1H-NMR spectroscopy. The AllNAc-derived α-D-and β-D-pyranosides 4–7, the AllNAc diazirine 16, and the GlcNAc-derived axial anomers α-D-8–10 prefer the (Z)-anti-conformation. A significant population of the (Z)-syn-conformer in the (Z)-syn/(Z)-anti-equilibrium