FIELD: synthesis of nucleosides, more particularly medical practice. SUBSTANCE: 3'-azido-2', 3'- dideoxythymidine is prepared by azidizing 5-0-aroyl-2,3'- anhydrothymidine with sodium azide in aprotic dipolar solvent in the presence of trivalent boron compound and subsequently removing protective group and isolating the desired product. Azidation is carried out at sodium azide to trivalent boron compound molar ratio of (1.4- 3.0): 1 at 100-110 C. Trivalent boron compound is preferably metaboric acid. Yield of the desired product is 70-80% and purity is 99.0-99.5%. EFFECT: more efficient preparation method. 4 cl, ex
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