| abstract |
6-Substitued acyclicpyrimidine nucleoside derivatives represented by general formula (I) (wherein R 1 represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkylcarbonyl group, an arylcarbonyl group, an arylcarbonylalkyl group, an arylthio group or an aralkyl group, R 2 represents an arylthio group, an alkylthio group, a cycloalkylthio group, an arylsulfoxido group, an alkyl- sulfoxido group, a cycloalkylsulfoxido group, an alkenyl group, an alkynyl group, an aralkyl group, an arylcarbonyl group, an arylcarbonylalkyl group or an aryloxy group, R 3 represents a hydroxyalkyl group whose alkyl moiety may be interrupted by an oxygen atom, X represents an oxygen atom, a sulfur atom or an amino group, Y represents an oxygen atom or a sulfur atom, and A represents = N- or -NH-) or pharmaceutically acceptable salts thereof, a process for preparing these compounds, and antiviral agents containing the compounds as active ingredients are disclosed. |