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

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The surprising finding according the present invention is that it is possible to carry out the oxidation of 1,2:5,6-di-O-isopropylidene-α-D-glucofuranose with DMSO/acetic anhydride in one pot with the subsequent reduction of the 1,2:5,6-di-O-isopropylidene-α-D-ribofuranose-3-ulose to form 1,2:5,6-di-O-isopropylidene-α-D-allofuranose (formula I). It is very surprising that the reduction can be carried out in the presence of the oxidation mixture. It is also surprising that it is possible to use this oxidation procedure in large scale (1 mole), and that the lowest reported amount of excess acetic anhydride (5 times) provides 58 % yield of recrystallised and analytical pure 1,2:5,6-di-O-isopropylidene-α-D-allofuranose.

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