6533b7defe1ef96bd1275c87

RESEARCH PRODUCT

Synthesis and characterization of 4,6-O-butylidene-N-(2-hydroxybenzylidene)-beta-D-glucopyranosylamine: crystal structures of 4,6-O-butylidene-alpha-D-glucopyranose, 4,6-O-butylidene-beta-D-glucopyranosylamine and 4,6-O-butylidene-N-(2-hydroxybenzylidene)-beta-D-glucopyranosylamine

subject

description

4,6-O-Butylidene-N-(2-hydroxybenzylidene)-β-D-glucopyranosylamine was synthesized and characterized using analytical, spectral and single-crystal X-ray diffraction methods. 1H and 13C NMR studies showed the presence of the β-anomer, which has also been confirmed by the crystal structure. The molecular structure of this compound showed the presence of the tridentate ONO ligation-core. Both precursors, 4,6-O-butylidene-α-D-glucopyranose and 4,6-O-butylidene-β-D-glucopyranosylamine were characterized using single crystal X-ray diffraction. The α-anomeric nature of the former and β-anomeric nature of the latter were proposed based on 1H NMR studies and were confirmed by determining the crystal structures. In addition, the crystal structure of 4,6-O-butylidene-β-D-glucopyranosylamine revealed the C-1---N–glycosylation. In all the three molecules, the saccharide unit exhibits a 4C1 chair conformation. In the lattice, the molecules are connected by hydrogen-bond interactions. The conformation of 4,6-O-butylidene-N-(2-hydroxybenzylidene)-β-D-glucopyranosylamine is stabilized via an O–H...N, intramolecular interaction, and each molecule in the lattice interacts with three neighboring molecules through hydrogen bonds of the type O–H...O and C–H...O.