Novel piperazine derivatives having the general formula: ##STR1## wherein R is hydrogen or lower alkyl, A is straight or branched chain lower alkyl, and R.sub.1 and R.sub.2 are each hydrogen, amino, alkylamino, dialkylamino, mono- or di(hydroxyalkyl)amino, morpholino, pyrrolidino, piperidino, N-alkylpiperazino, 1,3-dithiolan-2-ylidenamino, or N-alkylureido, with the proviso that at least one of R.sub.1 and R.sub.2 is other than hydrogen, or the isomeric mixtures, individual enantiomers or pharmaceutically acceptable acid addition salts thereof, are therapeutically useful antianaphylactic and antibronchospastic agents.
                            具有一般式的新型
哌嗪衍
生物:##STR1## 其中R为氢或较低的烷基,A为直链或支链较低烷基,R.sub.1和R.sub.2分别为氢、
氨基、烷基
氨基、二烷基
氨基、单或双(羟基烷基)
氨基、吗啉基、
吡咯啉基、
哌啶基、N-烷基
哌嗪基、1,3-二
硫代
环戊烯-2-基
氨基或N-烷基
脲基,但R.sub.1和R.sub.2中至少有一个不是氢,或其异构混合物、单体对映体或药用酸盐具有治疗作用,可用作抗过敏和抗支气管痉挛剂。