Abstract
We present the novel synthesis of two sugar units that are central intermediates for the formation of members of the bicyclo-DNA and -RNA family. The synthesis starts from commercially available 1,2: 5,6-di-O-isopropylidene-alpha-D-glucofuranose. The key step involves the elaboration of a carbocyclic ring in a furanoside by rhodium(I)-catalyzed hydroacylation. Via this pathway, one of the sugar units is available in 8 steps and in an overall yield of 27%, while its deoxy derivative is obtained in 11 steps, which is 5 steps fewer than in our previous synthesis of this compound.
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