The present invention relates to a compounds of formula Iwherein A, Ar1, Ar2, R1, R2, R3, R4, R5, R6, m, n, o, p, s, t, and u are as defined herein or to a pharmaceutically active salt, a racemic mixture, an enantiomer, an optical isomer or a tautomeric form thereof. the present compounds are high potential NK-3 receptor antagonists for the treatment of depression, pain, psychosis, Parkinsons disease, schizophrenia, anxiety and attention deficit hyperactivity disorder (ADHD).