Processes for the preparation of compounds of the formula ##STR1## in which R and R.sup.1 are identical or different and represent hydrogen or halogen, in the racemic form or in the form of its pure enantiomers by cyclicizing compounds of the formula ##STR2## with 2,6-lutidine or by cyclicizing compounds of the formula ##STR3## with diethyl azodicarboxylate. Compounds where R is halogen are new and are useful as cerebral therapeutics, nootropics or in the reduction of increased glutamine pyruvate transaminase in serum.
制备公式##STR1##中R和R.sup.1代表氢或卤素的化合物的方法,其中R和R.sup.1相同或不同,并以消旋形式或其纯对映体形式通过将公式##STR2##的化合物与2,6-
吲哚啉环化,或者将公式##STR3##的化合物与乙二酰二
氨基甲酸乙酯环化。其中R为卤素的化合物是新的,并可用作脑治疗药物、脑力药或用于降低血清中谷
氨酸
丙酮转
氨酶增高的化合物。