Since the identification of the dopamine D4 receptor subtype and speculations about its possible involvement in schizophrenia, much work has been put into development of selective D4 ligands. These selective ligands may be effective antipsychotics without extrapyramidal side effects. This work describes the synthesis of a new series of 2, 4- disubstituted morpholines and 2, 4-disubstituted 1, 4-oxazepanes with selectivity for the ...