The invention relates to 5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine derivatives of formula (I), wherein X represents CH2 or O; R1 represents a phenyl group, which group is independently mono-, di-, or tri-substituted wherein the substituents are independently selected from the group consisting of (C1-4)alkyl, (C1-4)alkoxy, halogen, cyano, trifluoromethoxy and trifluoromethyl; R2 represents (C1-4)alkyl, (C1-4)alkoxy, (C2-4)alkenyl, halogen, cyano, hydroxymethyl, trifluoromethyl, C(O)NR5R6 or cyclopropyl; R3 represents (C1-4)alkyl, (C1-4)alkoxy-methyl or halogen; R4 represents (C1-4)alkyl; R5 represents hydrogen or (C1-4)alkyl; and R6 represents hydrogen or (C1-4)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.
本发明涉及一种式为(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(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;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。本发明还涉及该类化合物的药学上可接受的盐;以及将该类化合物用作药物,特别是促进睡眠的药物。