Piperidine and piperazine derivatives which function as 5-ht2a receptor antagonists

摘要

Compounds of the formula I in which R1, R2, X, Y and alk are as defined in claim 1, are potent 5-HT2A antagonists and are suitable for the treatment of psychoses, schizophrenia, depression, neurological disorders, memory disorders, Parkinson's disease, amyotrophic lateral sclerosis, Alzheimer's disease, Huntington's disease, eating disorders, such as bulimia, anorexia nervosa, premenstrual syndrome and/or for positively influencing obsessive-compulsive disorder (OCD).