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Regioselective 2′-O-deacetylation of 9-(2,5-di-O-acetyl-3-bromo-3-deoxy-β-D-xylofuranosyl)adenine (1) is achieved by treatment of 1 with β-cyclodextrin (β-CyD) / aq. NaHCO3 or N2H4·H2O / EtOH. The 9-(5-O-Acetyl-3-bromo-3-deoxy-β-D-xylo-furanosyl)adenine (2) obtained is a common intermediate for the synthesis of 2′,3′-dideoxy-adenosine (ddA) (7) and 9-(2-fluoro-2,3-dideoxy-β-D-threo-pentofuranosyl)-adenine (F-ddA) (9).
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