Acetic Anhydride → 1,2:5,6-Bis-O-(1-methylethylidene)-alpha-D-allofuranose

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In a preferred embodiment of the method according to the invention, 1,2:5,6-di-O-isopropylidene-α-D-glucofuranose is reacted with a mixture of DMSO and acetic anhydride in a molar ratio of 1:3 to 1:9 at 20-25° C., for around 12-48 h, typically for around 24 h, followed by reaction with sodium borohydride at 20-25° C., for around 0.5-2 h, typically for around 1 h, in order to yield 1,2:5,6-di-O-isopropylidene-α-D-allofuranose. The two reactions are performed sequentially, i.e. without isolation or purification of the intermediate product, i.e. the ulose.

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