3'-Azido-2',3'-dideoxyuridine 5'-monophosphate → Uridine 5'-(tetrahydrogen triphosphate), 3'-azido-2',3'-dideoxy-

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The triphosphate can be prepared according to the procedure of Hoard et al., J. Am. Chem. Soc., 87(8), 1785-1788 (1965). For example, 3'-azido-2',3'-dideoxyuridine monophosphate is activated (by making a imidazolide, according to methods known to those skilled in the art) and treated with tributyl ammonium pyrophosphate in DMF. The reaction gives primarily 3'-azido-2',3'-dideoxyuridine triphosphate, with some unreacted monophosphate and some diphosphate. Purification by anion exchange chromatography of a DEAE column is followed by isolation of CS-87 triphosphate, e.g., as the tetrasodium salt.

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