Disclosed is a five-membered ring compound represented by formula (1) or a pharmaceutically acceptable salt thereof. The compound inhibits infiltration of leukocytes including eosinophils and lymphocytes, and is effective as a drug for treating various inflammations. The compound is highly safe and can be administered for a long period. A pharmaceutical product containing the five-membered ring compound or a pharmaceutically acceptable salt thereof is also disclosed.
(In the formula, R
1
represents a halogen atom or a phenyl group which may be substituted by a C
1
-C
3
alkyl group or a C
1
-C
3
alkoxy group; R
2
represents a C
1
-C
3
alkylene group which may be substituted by a C
1
-C
3
alkyl group or a carbonyl group; R
3
represents a C
1
-C
3
alkyl group; R
4
and R
5
independently represent a hydrogen atom or a C
1
-C
3
alkyl group, or —N(R
4
)R
5
may represent a morpholino group which may be substituted by a C
1
-C
3
alkyl group; Y
2
represents a C
2
-C
4
alkylene group; and R
6
represents a hydrogen atom, a halogen atom, a C
1
-C
3
alkyl group or a C
1
-C
3
alkoxy group.)
本发明涉及一种由式(1)表示的五元环化合物或其药学上可接受的盐。该化合物抑制白细胞浸润,包括嗜酸性粒细胞和淋巴细胞,是治疗各种炎症的有效药物。该化合物非常安全,可长期使用。本发明还涉及一种含有该五元环化合物或其药学上可接受的盐的制药产品。(在式中,R1表示卤素原子或苯基,可以被C1-C3烷基或C1-C3烷氧基取代;R2表示C1-C3烷基,可以被C1-C3烷基或羰基取代;R3表示C1-C3烷基;R4和R5独立地表示氢原子或C1-C3烷基,或—N(R4)R5可以表示一个
吗啡环基,可以被C1-C3烷基取代;Y2表示C2-C4烷基;R6表示氢原子、卤素原子、C1-C3烷基或C1-C3烷氧基。)