6-substitutted acyclopyrimidine nucleoside derivatives represented by the following general formula I: ##STR1## wherein R.sup.1 represents a hydrogen or halogen atom or a group of alkyl, alkenyl, alkynyl, alkylcarbonyl, arylcarbonyl, arylcarbonylalkyl, arylthio or aralkyl; R.sup.2 represents a group of arylthio, alkylthio, cycloalkylthio, aryl sulfoxide, alkyl sulfoxide, cycloalkyl sulfoxide, alkenyl, alkynyl, aralkyl, arylcarbonyl, arylcarbonylalkyl or aryloxy; R.sup.3 represents a hydroxyalkyl group of which alkyl portion may contain an oxygen atom; X represents an oxygen or sulfur atom or amino group; Y represents an oxygen or sulfur atom; and A represents .dbd.N-- or --NH-- or pharmaceutically acceptable salts thereof, processes for their preparation and antiviral agents containing them as active ingredients.
6-取代的环状
嘧啶核苷衍
生物,其代表以下通式I:##STR1## 其中R.sup.1代表氢或卤素原子或烷基、烯基、炔基、烷基
甲酸基、芳基
甲酸基、芳基
甲酸烷基、芳基
硫或芳烷基;R.sup.2代表芳基
硫、烷基
硫、环烷基
硫、芳基亚砜、烷基亚砜、环烷基亚砜、烯基、炔基、芳烷基、芳基
甲酸、芳基
甲酸烷基或芳氧基;R.sup.3代表羟基烷基,其中烷基部分可含氧原子;X代表氧或
硫原子或
氨基;Y代表氧或
硫原子;A代表.dbd.N--或--NH--或其药物可接受的盐,其制备过程以及含有它们作为活性成分的抗病毒剂。