FIELD: organic chemistry. SUBSTANCE: product: purinyl- or pyrimidinyl-derivatives of methylenecyclopentyl of the formula (I) 
where R1 group of the formula (II) 
; (III) 
; (IV) 
; (V) 
; R2 halogen, C1-C3-alkyl, -CH=CHR3; R3 chlorine, iodine, bromine. Reagent 1: derivatives of purine or pyrimidine. Reagent 2: hydroxymethylenecyclopentyl. Reaction conditions: process is carried out in the presence of base lithium, sodium or potassium hydride, in the medium of aprotonic solvent dimethylformamide, dimethylsulfoxide or sulfolane. Synthesized compounds were used in medicine. EFFECT: improved method of synthesis. 17 cl, 1 tbl
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