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Photobromination of 2,3,4-tri-O-acetyl-1,6-anhydro-β-D-glucopyranose gives the syrupy 6S (exo) bromide in high yield; further reaction leads to secondary bromination at this position. The monobromide reacts with methanol and thiophenol under conditions of kinetic control to give mainly the endo-methoxy and -phenylthio derivatives formed by direct nucleophilic displacement, and from the latter the exo-methoxy acetal was obtained by a second nucleophilic substitution. Acetolysis of these compounds can lead to the corresponding exo-6-acetoxy ester or monocyclic products formed by opening of the five-membered rings.

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Behandlung der lodide (I) mit Zn/Ethanol gibt die acyclischen D‐xylo‐Hexenosen (III), die in die Heterobicyclen (IV) übergeführt werden.