We have continued our search for analogs of the psychotropic preparation pyrazidole [i] by synthesizing some hitherto inaccessible l, lO-trimethylene-2-alkyl-l, 2, 3, 4- tetrahydropyrazino (l, 2-a) indoles (Ia-p) with different substituents in positions 6, 7, and 8 and examining them in tests of psychotropi c activity. The starting compounds were 7-chloro- (IIa), 8-methyl-(IIb), 8-bromo-(IIc), and 8-chloro-l, 10-trimethylenepyrazino (l, 2-a) indole ( ...