A compound of the formula: ##STR1## in which the enantiomeric form is d,1 or 1- when R.sup.5 is hydrogen and d,1 or 1-threo when R.sup.5 is other than hydrogen; R.sup.1 and R.sup.2 are, independently, hydrogen, alkyl of 1 to 6 carbon atoms, alkoxy of 1 to 6 carbon atoms, halo, perfluoroalkyl of 1 to 3 carbon atoms, nitro, alkanoyl of 2 to 4 carbon atoms or alkoxycarbonyl of 2 to 4 carbon atoms; R.sup.3 is hydrogen, halo, nitro or alkanoyl of 2 to 4 carbon atoms; R.sup.5 and R.sup.6 are, independently, hydrogen or methyl; or a non-toxic acid addition salt thereof, are central nervous system stimulants.
化合物的式子为:##STR1## 其中对映异构体为d,1或1-当R.sup.5为氢时,为d,1或1-threo当R.sup.5不是氢时;R.sup.1和R.sup.2分别为氢、1到6个碳原子的烷基、1到6个碳原子的烷氧基、卤素、1到3个碳原子的
全氟烷基、硝基、2到4个碳原子的烷酰基或2到4个碳原子的烷氧羰基;R.sup.3为氢、卤素、硝基或2到4个碳原子的烷酰基;R.sup.5和R.sup.6分别为氢或甲基;或其无毒酸加成盐,是中枢神经系统兴奋剂。