NEW ANTIVIRAL HOMOCARBOCYCLIC NUCLEOSIDE DERIVATIVES OF SUBSTITUTED PYRIMIDINEDIONES, METHOD OF THEIR SYNTHESIS AND COMPOSITION CONTAINING THEREOF AS ACTIVE COMPONENTS Russian patent published in 1999 - IPC

FIELD: organic chemistry. SUBSTANCE: invention relates to a new compound of the general formula (I) and its pharmaceutically acceptable salts and a method of synthesis of these derivatives and a pharmaceutical composition showing an antiviral activity and containing these derivatives as an active component where R₁,R₂ and R₃ mean independently hydrogen, halogen atom, C₁-C₅-alkyl; Z means oxygen, sulfur atom and carbonyl group; X means oxygen atom; n = 1-2 and (sub)cycloalk(en)yl means: or where means or where R₄ and R₅ mean independently hydrogen atom, hydroxymethyl, hydroxymethyl protected by the substituted silyl-group. EFFECT: new nucleoside derivatives, antiviral activity, improved method of synthesis. 4 cl, 1 tbl, 55 ex