The invention relates to 5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine derivatives of formula (I) wherein R
1
, R
2
, R
3
, and R
4
are as described n the description, to salts, especially pharmaceutically acceptable salts thereof, and to the use of such compounds as medicaments; especially as orexin receptor antagonists.
这项发明涉及式(I)的5,6,7,8-四
氢咪唑[1,5-a]
吡嗪衍
生物,其中R1、R2、R3和R4如描述中所述,以及其盐,特别是药用可接受的盐,以及将这类化合物用作药物的用途;特别是作为促进睡眠的受体
拮抗剂。