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An investigation of the structural requirements for CNS activity of the title compounds was undertaken. A synthesis of the precursor dihydro-10H-thieno[3,4-b][1,5]benzodiazepin-10-ones was achieved and three routes for their conversion to the title compounds were developed. The compounds were tested for neuroleptic activity by means of the blockade or d-amphetamine lethality in aggregated mice and/or effects on locomotor activity in rats. Antidepressant activity was examined using inhibition of tetrabenazine-induced depression in mice. Most of the compounds were found to be potent neuroleptic agents with several exhibiting additional antidepressant activity.