Three small cluster oligosaccharide mimetics were synthesized, and their CDCl3 solution conformations were determined with NMR experiments. In this paper, we confirmed conformational similarities in rings A and B in all three compounds, and we provide the overall solution geometries. In all cases, an unusual cyclohexane twist-boat conformation with longrange 4 J-(W)-coupling was observed. The origin of the bias towards the twist-boat was attributed primarily to the fused ring system between the cyclohexane ring and the dioxacyclopentane (acetal) including hydrogen bonding. Temperature-annealed molecular dynamics simulations complemented the NMR experiments and supported the overall assignment.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Nguyen, Q. L.,
Franz, A. H.
Solution conformations of three small cluster oligosaccharide mimetics (SCOM) from D-glucosamine, D-altrosamine, and (-)-quinic acid.
ARKIVOC, 2007(13), 235–251.