Compounds are presented of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, amino, halogen and nitro; R.sub.2 is selected from the group consisting of hydrogen, lower alkyl, carboxylic acids, esters and primary, secondary or tertiary amides thereof, alkylhydroxy, acylhydroxy-lower alkyl, amino-lower alkyl, alkylamino-lower alkyl, acylamino-lower alkyl and carboxaldehyde; and X is hydrogen or halogen and the pharmaceutically acceptable salts thereof. Also presented are processes to produce the above compounds and intermediates thereof.
本发明涉及一种具有以下式子的化合物:##STR1## 其中R.sub.1从氢、
氨基、卤素和硝基中选择;R.sub.2从氢、低级烷基、
羧酸、酯及其一级、二级或三级酰胺、烷基羟基、酰基羟基-低级烷基、
氨基-低级烷基、烷基
氨基-低级烷基、酰胺基-低级烷基和羧基醛中选择;X为氢或卤素及其药学上可接受的盐。还提供了制备上述化合物及其中间体的方法。