The action of diethylaminosulfur trifluoride (DAST) on 1-(4,6-O-isopropylidene-β-D-glucopyranosyl)pyrimidines, a one-pot synthesis of 2,2'-anhydro-1-(3-deoxy-3-fluoro-4,6-O-isopropylidene-β-D-altropyranosyl)pyrimidines

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