Preferred conformation of C-glycosides. 6. Conformational similarity of glycosides and corresponding C-glycosides
作者:Peter G. Goekjian、Tse Chong Wu、Yoshito Kishi
DOI:10.1021/jo00022a038
日期:1991.10
The conformation of the alpha-(axial)-C-glycosides 1-3 and the beta-(equatorial)-C-glycosides 4-6 were studied by H-1 NMR. Their preferred solution conformation was found to match that of the corresponding parent glycosides. The study of 2-deoxy compounds 13-16 shows that the preference is due primarily to gauche interactions around the glycosidic bond. Solvent studies indicate that electrostatic interactions and hydrogen bonds do not significantly alter the overall conformation. Temperature studies suggest that these compounds exist as an equilibrium mixture of conformers.
Synthesis of C-Glucosyl Aminooxy Esters
作者:Juan Xie、Sandrine Peyrat、Keguang Cheng
DOI:10.1055/s-0033-1339496
日期:——
the ready availability of C-allyl glycosides, the present methodology could be applied to the synthesis of other C-glycosyl aminooxy acid derivatives. Glycosyl amino acids are constituents of glycopeptides and glycoproteins playing key roles in biological processes. We have synthesized C-glucosyl aminooxy acid derivatives as novel glycosyl amino acid building blocks for the generation of glycopeptide