Synthesis of 6-Mercaptohexanoylhydrazones of Mono- and Disaccharides as a Potential Glycoligands of Noble Metal Glyconanoparticles
作者:A. Yu. Еrshov、А. А. Маrtynenkov、I. V. Lagoda、А. V. Yakimansky
DOI:10.1134/s1070363220100084
日期:2020.10
The H-1 and C-13 NMR spectroscopy was used to study the structure of previously unknown aldose series condensation products (L-fucose, L-rhamnose, D-mannose, D-galactose, D-glucose, N-acetyl-D-glucosamine, N-acetyl-D-mannosamine, D-lactose and D-maltose) with 6-mercapto-hexanoic acid hydrazide-promising glycoligands of noble metal nanoparticles. It was shown that L-fucose, L-rhamnose, D-mannose, D-galactose and N-acetyl-D-mannosamine derivatives exist in solution in DMSO-d(6) as a tautomeric mixture of open hydrazone and cyclic pyranose forms. The linear hydrazone form is represented by a set of Z ',E '-conformational isomers, which differ in the arrangement of substituents relative to the C-N amide bond in comparable amounts. The condensation products obtained on the basis of D-glucose, N-acetyl-D-glucosamine, D-lactose and D-maltose in the crystalline state and in solutions in DMSO-d(6) have an exclusively cyclic pyranose structure represented by alpha,beta-configurational isomers. A similar transition to the pyranose form is observed in solutions of all the studied compounds in D2O.