Derivatives having the formula: ##STR1## where R.sub.1 denotes C.sub.1 -C.sub.4 alkyl; X denotes oxygen or methylene; R.sub.2 denotes C.sub.1 -C.sub.4 alkyl or CF.sub.3 ; R.sub.3 denotes a CH.sub.2 R.sub.4 group in which R.sub.4 is (i) a pentagonal or hexagonal aromatic heterocyclic group comprising one or two nitrogen atoms and optionally fused with a benzene ring or (ii) a group having the formula ##STR2## where n=0 or 1, and R.sub.5 and R.sub.6 independently denote C.sub.1 -C.sub.4 alkyl or benzyl, and R.sub.5 and R.sub.6 also, together with the nitrogen atom to which they are bonded, form a piperidino or pyrrolidino or morpholino or N-methyl piperazino radical, and their N-oxide forms and acid addition salts of these derivatives and their N-oxide forms, the derivatives being in various stereoisomeric forms or in the form of a mixture of these forms, including the racemic form.
具有以下式子的衍
生物:##STR1## 其中R.sub.1表示C.sub.1-C.sub.4烷基;X表示氧或亚甲基;R.sub.2表示C.sub.1-C.sub.4烷基或CF.sub.3;R.sub.3表示一个CH.sub.2R.sub.4基团,其中R.sub.4是(i)一个五角形或六角形芳香杂环基团,包含一个或两个氮原子,并且可以与苯环融合,或(ii)具有以下式子的基团##STR2## 其中n=0或1,R.sub.5和R.sub.6独立地表示C.sub.1-C.sub.4烷基或苄基,R.sub.5和R.sub.6也可以与它们连接的氮原子一起形成
哌啶基、
吡咯烷基、吗啉基或
N-甲基哌嗪基团,以及这些衍
生物和它们的N-氧化物形式的酸加成盐,这些衍
生物以各种立体异构体形式存在,或以这些形式的混合物形式存在,包括外消旋形式。