| abstract |
The invention provides melanin-concentrating hormone receptor antagonists containing as the active ingredient piperidine derivatives represented by the general formula [I]: n n [wherein R 1 is hydrogen, hydroxyl, lower alkyl, or the like; R 2 , R 3a , R 3b , R 4a , R 4b , R 5a , R 5b and R 6 each stands for hydrogen, halogen, or the like; W 1 and W 2 each independently stands for —O—, —CH 2 —, or the like; Y 1 , Y 2 , Y 3 and Y 4 stand for —CH—, —CF—, —N—, or the like; Z stands for lower alkyl, an aliphatic heterocyclic group, or the like; Ar is a mono- or bi-cyclic aliphatic heterocycle or an aromatic heterocycle; and n is an integer of 1 to 8]. The compounds act as antagonist against melanin-concentrating hormone receptor and are useful as drugs for central diseases, circulatory diseases, or metabolic diseases. |