Compounds of the formula ##STR1## wherein each R is hydrogen or one R is hydrogen and the other is lower alkyl, R.sub.1 is hydrogen, lower alkyl, aryl, aralkyl or lower carboalkoxy, R.sub.2 is hydrogen or lower alkyl, and the ring A is unsubstituted or substituted by lower alkyl, lower alkoxy, halo or trifluoromethyl, and pharmaceutically acceptable salts thereof, their preparation, pharmaceutical compositions and the uses thereof, such as .alpha..sub.2 -adrenergic blocking agents, e.g. antidepressants, cognition enhancers and appetite suppressants, and as intraocular pressure reducing agents are disclosed.
本发明揭示了分子式为##STR1##的化合物,其中每个R是氢或一个R是氢,另一个是低碳基,R.sub.1是氢、低碳基、芳香基、芳香烷基或低碳基
羧酸酯,R.sub.2是氢或低碳基,环A是未取代或被低碳基、低氧基、卤素或三
氟甲基取代,以及其药学上可接受的盐,它们的制备、制药组合物和用途,例如α.sub.2-
肾上腺素能阻断剂,例如抗抑郁剂、认知增强剂和食欲
抑制剂,以及作为降低眼压的药物。