Acetic Anhydride → 3'-Azido-2',3'-dideoxy-5-bromouridine

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3'-Azido-5-bromo-2',3'-dideoxyuridine was prepared from the known 3'-azido-2',3'-dideoxyuridine (T. A. Krenitsky, et al., J. Med. Chem., 26, 891, (1983)) (0.827 g, 3.3 mMol) by first acetylating the 5'-hydroxyl group with acetic anhydride (15 mL) then by brominating the 5 position by the addition of acetic acid (0.5 mL) and bromine (0.566 g). The red-brown solution was stirred at room temperature for two hours. The reaction was taken to an oil in vacuo and triturated with ethyl ether. The oil was dissolved in methanol ammonia to remove the acetyl group. The desired product was isolated by chromatography on silica gel by elution with CHCl3 :MeOH (95:5 v/v). The yield was 32%; mp=148°-149° C.

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