The invention relates to 5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine derivatives of formula (I), wherein X represents CH
2
or O; R
1
represents a phenyl group, which group is independently mono-, di-, or tri-substituted wherein the substituents are independently selected from the group consisting of (C
1-4
)alkyl, (C
1-4
)alkoxy, halogen, cyano, trifluoromethoxy and trifluoromethyl; R
2
represents (C
1-4
)alkyl, (C
1-4
)alkoxy, (C
2-4
)alkenyl, halogen, cyano, hydroxymethyl, trifluoromethyl, C(O)NR
5
R
6
or cyclopropyl; R
3
represents (C
1-4
)alkyl, (C
1-4
)alkoxy-methyl or halogen; R
4
represents (C
1-4
)alkyl; R
5
represents hydrogen or (C
1-4
)alkyl; and R
6
represents hydrogen or (C
1-4
)alkyl. The invention also relates to pharmaceutically acceptable salts of such compounds; and to the use of such compounds as medicaments; especially as orexin receptor antagonists.
本发明涉及公式(I)的5,6,7,8-四
氢咪唑[1,5-a]
吡嗪衍
生物,其中X代表
CH2或O; R1代表
苯基,该基团独立地单取代、双取代或三取代,其中取代基独立地选自由(C1-4)烷基,(C1-4)烷
氧基,卤素,
氰基,三
氟甲
氧基和三
氟甲基的群组; R2代表(C1-4)烷基,(C1-4)烷
氧基,(C2-4)
烯基,卤素,
氰基,
羟甲基,三
氟甲基,C(O)NR5R6或环丙基; R3代表(C1-4)烷基,(C1-4)烷
氧甲基或卤素; R4代表(C1-4)烷基; R5代表
氢或(C1-4)烷基; R6代表
氢或(C1-4)烷基。本发明还涉及这种化合物的药学上可接受的盐;以及将这种化合物用作药物的用途;特别是作为促进睡眠激素受体
拮抗剂。