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The 2′-substituted-4′-selenoribofuranosyl pyrimidines 3a–3j were synthesized from D-ribose and assayed for anticancer activity. The 2′-azido and 2′-fluoro groups with a ribo configuration were introduced by the regioselective opening of the O2,2′-anhydronucleosides with sodium azide and (HF)x-pyridine, respectively. Among the compounds tested, only 2′-fluoro derivative 3j was found to exhibit significant...
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