This invention provides a compound or its pharmaceutically-acceptable salt of formula (I)
wherein R
1
represents a lower alkyl group et al; R
2
and R
3
are same and different and represents hydrogen atm et al; R
4
represents the substituent of the formula (I) et al;
X
1
represents NH, O or S; Y represents N or C; Ar is a divalent substituent derived from aryl et al, by removing two hydrogen atoms therefrom; the ring A represents a 5- or 6-membered heteroaryl group; this compounds has a histamine-H3 receptor antagonistic effect or a histamine-H3 receptor inverse-agonistic effect and is useful for preventive or remedy of metabolic system diseases, circulatory system diseases or nervous system diseases.
本发明提供了式(I)的化合物或其药学上可接受的盐,其中R1代表较低的烷基等;R2和R3相同或不同,分别代表氢原子等;R4代表式(I)的取代基等;X1代表NH、O或S;Y代表N或C;Ar是由芳基衍生的二价取代基等,通过去除其中的两个氢原子而得到;环A表示5-或6-成员杂芳基基团;这些化合物具有
组胺H3受体拮抗作用或
组胺H3受体反向激动剂作用,并且对于预防或治疗代谢系统疾病、循环系统疾病或神经系统疾病是有用的。