The present invention provides a compound represented by formula (I) below, or a pharmaceutically acceptable salt thereof, which, having histamine H3 receptor antagonist or inverse agonist activity, is useful in the prophylaxis or therapy of metabolic diseases, circulatory diseases, or nervous system diseases.
[where, for example, Ar is a divalent group formed by eliminating two hydrogen atoms from benzene, X1 is a nitrogen atom, sulfur atom or oxygen atom, R1 is a 5- to 6-membered heteroaryl group, Ring A is a 5- to 6-membered heteroaryl ring, R2 and R3 are amino groups or alkylamino groups, and X2 is represented by formula (II):
(where R4 and R5 are lower alkyl groups, and n is an integer from 2 to 4).]
本发明提供了由下式(I)代表的化合物或其药学上可接受的盐,该化合物具有
组胺 H3 受体
拮抗剂或反向激动剂活性,可用于预防或治疗代谢性疾病、循环系统疾病或神经系统疾病。
[其中,Ar 是通过从
苯中消除两个
氢原子而形成的二价基团,X1 是
氮原子、
硫原子或
氧原子,R1 是 5 至 6 元杂芳基,环 A 是 5 至 6 元杂芳基环,R2 和 R3 是
氨基或烷基
氨基,X2 由式 (II) 表示:
(其中 R4 和 R5 为低级烷基,n 为 2 至 4 的整数)]。