A convenient method is suggested of synthesis of (3R, 4R)-, (3S, 4S)- and (3R/S, 4S/R)-dihydroxy-3-hydroxymethyl-2-oxapentyl derivatives of the, cytosine, uracyl, adenine and guanine ("full" acyclic analogues of nucleosides with C1'-C2' bond cleaved) by condensation of trimethylsilyl derivatives of nucleic bases (sodium salt in case of adenine) with (3$, 4R)-, (3S )-, (3S, 4S)- and (3R/S, 4S/R)-4,5-diacetoxy-3-acetoxymethyl-1-chloro-2-oxapentanes without catalyst followed by deacetylation.
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