Compounds useful as antiviral agents are defined by the following formula: ##STR1## and the pharmaceutically acceptable acid addition salts thereof wherein R.sup.1 is hydrogen or --C(O)R.sup.7 wherein R.sup.7 is hydrogen, alkyl of one to nineteen carbon atoms, hydroxyalkyl of one to eight carbon atoms, alkoxyalkyl of two to nine carbon atoms, alkenyl of two to nineteen carbon atoms, phenyl, 1-adamantyl or 2-carboxyethyl and the pharmaceutically acceptable alkali metal salts thereof; R.sup.2 is --C(O)R.sup.7 is as defined above; R.sup.3 is hydrogen, halo, thio, lower alkylthio of one to six carbon atoms, azido, NR.sup.9 R.sup.10 wherein R.sup.9 and R.sup.10 are independently hydrogen or lower alkyl of one to six carbon atoms or --NHC(O)R.sup.8 wherein R.sup.8 is hydrogen, alkyl of one to nineteen carbon atoms or 1-adamantyl; and (a) R.sup.6 is hydrogen, halo, lower alkoxy of one to six carbon atoms, azido, thio, lower alkylthio of one to six carbon atoms, --NR.sup.9 R.sup.10 and R.sup.9 and R.sup.10 are as defined above or --NHC(O)R.sup.8 is as defined above and R.sup.4 together with R.sup.5 is a bond; or (b) R.sup.5 together with R.sup.6 is a keto group and R.sup.4 is hydrogen.
具有抗病毒活性的化合物的定义式为:##STR1##及其药学上可接受的酸盐,其中R.sup.1为氢或--C(O)R.sup.7,其中R.sup.7为氢、1至19个碳原子的烷基、1至8个碳原子的羟基烷基、2至9个碳原子的烷氧基烷基、2至19个碳原子的烯基、苯基、1-
金刚烷基或2-羧乙基及其药学上可接受的碱
金属盐;R.sup.2为--C(O)R.sup.7,如上所定义;R.sup.3为氢、卤素、
硫、1至6个碳原子的低烷基
硫、偶氮基、NR.sup.9 R.sup.10,其中R.sup.9和R.sup.10独立地为氢或1至6个碳原子的低烷基,或--NHC(O)R.sup.8,其中R.sup.8为氢、1至19个碳原子的烷基或1-
金刚烷基;以及(a)R.sup.6为氢、卤素、1至6个碳原子的低烷氧基、偶氮基、
硫、1至6个碳原子的低烷基
硫、--NR.sup.9 R.sup.10,其中R.sup.9和R.sup.10如上所定义,或--NHC(O)R.sup.8如上所定义,且R.sup.4与R.sup.5一起为键;或(b)R.sup.5与R.sup.6一起为酮基,R.sup.4为氢。