Piperidinyl, pyrrolidinyl, azepinyl and piperazinyl pyridazines of formula ##STR1## wherein one or two carbon atoms of the ##STR2## moiety may be substituted with C.sub.1-4 alkyl, C.sub.1-4 alkyloxy or two carbon atoms of the CH.sub.2 groups of said moiety may be bridged with a C.sub.2-4 alkanediyl radical; X represents CH or N; R.sup.1 represents hydrogen, C.sub.1-4 alkyl, halo, hydroxy, trifluoromethyl, cyano, C.sub.1-4 alkyloxy, C.sub.1-4 alkylthio, C.sub.1-4 alkylsulfinyl, C.sub.1-4 alkylsulfonyl, C.sub.1-4 alkyloxycarbonyl, C.sub.1-4 alkylcarbonyl or aryl; R.sup.2 and R.sup.3 each independently represent hydrogen or C.sub.1-4 alkyl; Alk represents C.sub.1-4 alkanediyl; R.sup.4 and R.sup.5 each independently represent hydrogen, C.sub.1-4 alkyl or halo; and Het represents ##STR3## the addition salts and stereochemically isomeric forms thereof, said compounds having antipicornaviral activity. Pharmaceutical compositions containing these compounds as active ingredient, and a method of preparing said compounds and pharmaceutical compositions.
式为##
STR1##的
哌啶基、
吡咯啉基、
氮杂七环基和
哌嗪基
吡啶嘧啶,其中##
STR2##部分的一个或两个
碳原子可以被C.sub.1-4烷基、C.sub.1-4烷
氧基取代,或者该部分的CH.sub.2基团的两个
碳原子可以通过C.sub.2-4烷二基基团桥接;X代表CH或N;R.sup.1代表
氢、C.sub.1-4烷基、卤素、羟基、三
氟甲基、
氰基、C.sub.1-4烷
氧基、C.sub.1-4烷
硫基、C.sub.1-4烷基
亚砜基、C.sub.1-4烷基磺酰基、C.sub.1-4烷
氧羰基、C.sub.1-4烷基羰基或芳基;R.sup.2和R.sup.3各自独立地代表
氢或C.sub.1-4烷基;Alk代表C.sub.1-4烷二基;R.sup.4和R.sup.5各自独立地代表
氢、C.sub.1-4烷基或卤素;Het代表##
STR3##的加合盐和立体
化学异构体,这些化合物具有抗肠病毒活性。含有这些化合物作为活性成分的制药组合物,以及制备这些化合物和制药组合物的方法。