Compounds of formula (I) and pharmaceutically acceptable salts thereof:
wherein
R₁ is hydroxy, amino, chloro or OR₇
wherein
R₇ is C₁₋₆ alkyl, phenyl or phenyl C₁₋₂ alkyl either of which phenyl moieties may be substituted by one or two substituents selected from halo, C₁₋₄ alkyl or C₁₋₄ alkoxy;
R₂ is amino or, when R₁ is hydroxy or amino, R₂ may also be hydrogen;
X is -CH₂CH₂- or a moiety of structure (a), (b) or (c):
wherein
n is 1 or 2; and
R₃ is hydrogen or acyl;
R₄ is a group of formula:
wherein
R₅ and R₆ are independently selected from hydrogen,
C₁₋₆ alkyl and optionally substituted phenyl; having anitiviral activity, processes for their preparation and their use as pharmaceuticals.
式 (I) 的化合物及其药学上可接受的盐类:
其中
R₁ 是羟基、
氨基、
氯或 OR₇
其中
R₇ 是 C₁₋₆烷基、
苯基或
苯基 C₁₋₂烷基,其中任一
苯基可被一个或两个选自卤代、C₁₋₄ 烷基或 C₁₋₄ 烷
氧基的取代基取代;
R₂ 是
氨基,或者当 R₁ 是羟基或
氨基时,R₂ 也可以是
氢;
X 是-CH₂CH₂- 或结构式(a)、(b)或(c)的分子:
其中
n 是 1 或 2;以及
R₃ 是
氢或酰基;
R₄ 是式中的基团:
其中
R₅ 和 R₆ 独立选自
氢、
C₁₋₆烷基和任选取代的
苯基。