Indoline and piperazine containing derivatives as a novel class of mixed D2/D4 receptor antagonists. Part 2: Asymmetric synthesis and biological evaluation

A series of chiral benzylpiperazinyl-1-(2,3-dihydro-indol-1-yl)ethanone derivatives were prepared and examined for their affinity at dopamine D2 and D4 receptors. Three compounds having D2/D4 affinity ratios approximating that found for the atypical neuroleptic clozapine were further evaluated in behavioral tests of antipsychotic efficacy and motor side effects.