Remedy for sleep disturbance
View Patent ↗The present invention has been made based on the finding that a compound acting on the ORL-1 receptor as an agonist acts as a non-photic entrainment factor, and advances the circadian rhythm phase, and provides a novel therapeutic agent for a sleep disorder such as circadian rhythm sleep disorder, more particularly, an agent for the prophylaxis and/or treatment of a sleep disorder, which contains an ORL-1 receptor agonist, and a novel compound useful as such agent for the prophylaxis and/or treatment.
1. A compound represented by the formula (I)
wherein
R 1 is lower alkyl-C(O)NR 3 R 4 ,
R 2 is hydrogen, lower alkyl, halogen, lower alkoxy, phenoxy, benzyloxy, trifluoromethyl, nitro, amino or cyano, and
R 3 and R 4 may be the same or different, and each is hydrogen, lower alkyl or lower alkenyl, or R 3 and R 4 may bind with an adjacent nitrogen atom to form a saturated nitrogen-containing hetero ring (the hetero ring may be substituted with lower alkyl, halogen, lower alkoxy, phenoxy or benzyloxy),
a racemic mixture thereof, an enantiomer corresponding thereto or a pharmaceutically acceptable salt thereof.
2. The compound of claim 1 , wherein R 2 is hydrogen, a racemic mixture thereof, an enantiomer corresponding thereto or a pharmaceutically acceptable salt thereof.
3. The compound of claim 1 , wherein R 1 is lower alkyl-C(O)NR 3 R 4 (either R 3 or R 4 is hydrogen) or lower alkyl-C(O)NR 3 R 4 wherein R 3 and R 4 bind with an adjacent nitrogen atom to form a saturated nitrogen-containing hetero ring (the hetero ring may be substituted with lower alkyl, halogen, lower alkoxy, phenoxy or benzyloxy), a racemic mixture thereof, an enantiomer corresponding thereto or a pharmaceutically acceptable salt thereof.
4. The compound of claim 1 , which is
(R)-2-{3-[1-(acenaphthen-1-yl)piperidin-4-yl]-2,3-dihydro-2-oxo-benzoimidazol-1-yl}-N-methylacetamide,
a racemic mixture thereof, an enantiomer corresponding thereto or a pharmaceutically acceptable salt thereof.
5. A pharmaceutical composition comprising an effective amount of the compound of claim 1 , a racemic mixture thereof, an enantiomer corresponding thereto or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.