Amino dialdoses

The generic term monosaccharide (as opposed to oligosaccharide or polysaccharide) denotes a single unit, without glycosidic connection to other such units. It includes aldoses, dialdoses, aldoketoses, ketoses and diketoses, as well as deoxy sugars and amino sugars, and their derivatives, provided that the parent compound has a (potential) carbonyl gTOup. 

The glycosyl a-amino aldehyde 70 obtained from the dialdose 49 through the nitrone 69 appeared nicely tailored for a rapid conversion to 71. This simply involved the reduction of the formyl group and removal of the hydroxyl and amino protective groups. This approach should be extendible to the synthesis of various aza sugars containing suitable structural modifications. 

Chemical ionization methods have been used with methyl ethers of methyl glycosides and have indicated that anomers with equatorial methoxy-groups decompose faster than those with axial groups. The same method applied to permethylated disaccharides allows better distinction between isomers than does the electron-impact method. A permethylated amino-sugar trisaccharide derivative has been studied as have permethylated dialdose anhydrides. ... 

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