The present invention relates to hitherto unknown compounds of formula or their tautomeric forms, the attachment to the pyridine ring being in the 3- or 4-position, in which R', R" are the same or different and stand for hydrogen, halogen, or trifluoromethyl, hydroxy, C.sub.1 -C.sub.4 alkyl or alkoxy, nitro, or cyano groups. Alkylene stands for a straight or branched C.sub.1 -C.sub.8 carbon chain, which may be substituted by hydroxy or halogen, nitro or cyano groups. X stands for oxygen, for --S(O).sub.n -- where n stands for an integer from 0 to 2, or for .dbd.N--R.sub.1 where R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl. R stands for hydrogen or for one or more C.sub.1 -C.sub.4 alkyl or alkoxy, hydroxy, halogen, trifluoromethyl, cyano, carboxamido, sulfamoyl or nitro radicals. The present compounds are of value in the human and veterinary practice as selective serotonin receptor antagonists.
本发明涉及式或其互变异构体的迄今未知的化合物,其附着在
吡啶环的3位或4位,其中R',R"相同或不同,代表氢,卤素或三
氟甲基,羟基,C.sub.1-C.sub.4烷基或烷氧基,硝基或
氰基。Alkylene代表直链或支链C.sub.1-C.sub.8碳链,可以被羟基或卤素,硝基或
氰基取代。X代表氧,代表--S(O).sub.n--,其中n为0至2的整数,或代表.dbd.N--R.sub.1,其中R.sub.1为氢或C.sub.1-C.sub.4烷基。R代表氢或一个或多个C.sub.1-C.sub.4烷基或烷氧基,羟基,卤素,三
氟甲基,
氰基,羧酰胺基,磺酰胺基或硝基基团。这些化合物在人类和兽医实践中作为选择性5-羟
色胺受体拮抗剂具有价值。