(Trifluoromethyl)sulfonyl (triflyl) migration. Synthesis of 6,3'-anhydro-3-benzyl-1-(5-chloro-5-deoxy-β-D- xylofuranosyl)barbituric acid from the 2'-trifluoromethanesulfonate (triflate) of 6,5'-anhydro-3-benzyl-1-β-D-ribofuranosylbarbituric acid

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