Compounds having the structure ##EQU1## and the pharmaceutically acceptable salts thereof, wherein R.sub.1 and R.sub.2 are the same or different and are selected from alkyl, cycloalkyl, aryl and arylalkyl; R.sub.3 is hydrogen, halogen, trifluoromethyl, alkoxy, aryloxy, or dialkylamidosulfonyl; R.sub.4 is hydrogen, halogen, alkyl, alkoxy or aryl; and n is 1 or 2, are useful central nervous system stimulants.
具有结构##EQU1##及其药学上可接受的盐,其中R.sub.1和R.sub.2相同或不同,且选自烷基,环烷基,芳基和芳基烷基; R.sub.3是氢,卤素,三
氟甲基,烷氧基,芳氧基或二烷基
氨基磺酰基; R.sub.4是氢,卤素,烷基,烷氧基或芳基; n为1或2,是有用的中枢神经系统兴奋剂。