Compounds of the formula: ##STR1## wherein R.sup.1 is hydrogen, lower alkyl or lower alkenyl, R.sup.2 is hydrogen, lower alkyl, or halogen, R.sup.3 is imidazolyl or pyridyl, each of which may have suitable substituents, and R.sup.4 is hydrogen, lower alkyl, lower alkenyl or hydroxy (lower) alkyl and R.sup.5 is hydrogen, hydroxy, or alkanoyloxy, or R.sup.4 and R.sup.5 are linked together to form an additional bond or novel pyridoindole derivatives which are useful as potent in selective antagonists of 5-HT receptors.
该式化合物中,R.sup.1为氢,低烷基或低烯基,R.sup.2为氢,低烷基或卤素,R.sup.3为
咪唑基或
吡啶基,每个基团可能具有适当的取代基,R.sup.4为氢,低烷基,低烯基或羟基(低)烷基,R.sup.5为氢,羟基或烷酰氧基,或者R.sup.4和R.sup.5连接在一起形成额外键或新型
吡啶吲哚衍
生物,它们可用作5-HT受体的选择性拮抗剂。