Anhydro Derivatives of Oligosaccharides

In the title oligosaccharides, one of the sugar residues is actually a 1,6-anhydrohexose residue. Thus far, only derivatives having a ter- 

O-benzyl, and other azido derivatives of levoglucosan were used as aglycons in disaccharide synthesis.538,539,8123 

Their reactions closely resemble those of 1,6-anhydrohexoses (compare Sect. IV) for the glycosyl group thereof, all reactions common for glycosides can be performed. The difference in the rate of hydrolysis of the 1,6-anhydride and the glycosidic bond permits a partial hydrolysis of 1,6-anhydro derivatives of oligosaccharides, leading to the 

The unusual 1,6-anhydro disaccharide 283, having an ether instead of a glycosidic linkage, was synthesized as an intermediate in the preparation of the exotoxin from Bacillus thuringiensis.442-5320,534,542 758-759 

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