Popis: |
Bicyclic azasugar analogues of D-xylose containing a glycosidic heteroatom have been prepared and characterized by X-ray crystallography and NMR spectroscopy. Compounds in which the glycosidic heteroatom is N (substituted with H or CH3), O, and S have been prepared, and the ring fused to the azasugar ring has been 5- or 6-membered; 7-membered analogues are either unstable or do not form. α-Anomers are present when the glycosidic heteroatom is O or S but not N, and even then they are less favored than the corresponding β-anomers. |