Compounds of the formula I CHEM wherein either R1 is halogen, R1 min is halogen or hydrogen and R2 and R2 min denote hydrogen or R1 and R1 min represent hydrogen, R2 is an aliphatic or aromatic radical and R2 min is hydroxy or R2 and R2 min together represent oxo, and wherein R denotes an aliphatic, cycloaliphatic, cycloaliphatic-aliphatic or araliphatic radical having 2 or more carbon atoms or, if R1 and R1 min denote hydrogen, R2 represents an aromatic radical and R2 min is hydroxy, R represents methyl, and their salts are useful as nootropics, antidepressants and/or anxiolytics. The can be manufacture by replacing any group R5 by hydrogen and/or converting any group Z0 into amino in a compound of formula II CHEM in which R, R1, R1 min , R2 and R2 min have their previous significances, Z represents a protected or latent amino group Z0 and R4 denotes hydrogen or a hydroxy-protective group R5, and wherein amino as a constituent of R and/or hydroxy R2 min or oxo R2 + R2 min may be present in a temporarily protected form.
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