FIELD: organic chemistry. SUBSTANCE: product: enantiometic nucleosides of the formula (I) 
where R - cyclopropylamine or N-cyclopropyl-N-methylamino-group; A - 2-cyclopentene-1-methanol-4-yl at configuration (1S, 4R) or (1R,4S) or their derivatives, yield is 74-95%. Reaction conditions: reagent 1: enantiomer of the formula (II) 
where Z - desplitting group; A - as indicated above. Reagent 2: corresponding alkylamine followed by conversion of product (I) 
to its salt, ester, monophosphate or esterified phosphate. Synthesized compounds were used as therapeutic agents for viral disease treatment. EFFECT: improved method of synthesis. 5 cl
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