The present invention provides a compound represented by the formula
wherein A represents (1) a bond, (2) a group represented by the formula —CR
a
═CR
b
— (R
a
and R
b
each represent a hydrogen atom or C
1-6
alkyl) and the like; R
1
represents (1) cyano or (2) an optionally esterified or amidated carboxyl group; R
2
represents (1) a hydrogen atom, (2) an optionally substituted hydroxy group, (3) an optionally substituted amino group and the like; R
3
and R
4
each represent a hydrogen atom and the like; R
5
represents a hydrogen atom and the like; R
6
represents an optionally substituted hydroxy group and the like; R
7
and R
8
each represent an optionally substituted hydrocarbon group and the like; R
9
and R
10
each represent (1) a hydrogen atom and the like; Y represents an optionally substituted methylene group; and n represents 0 or 1, or a salt thereof, which has an excellent phosphodiesterase IV inhibiting action.
本发明提供了一种化合物,其表示为以下式子:其中A代表(1)键合,(2)由以下式子表示的基团:—CRa═CRb—(Ra和Rb分别代表氢原子或C1-6烷基等);R1代表(1)
氰基或(2)可选酯化或酰胺化的羧基;R2代表(1)氢原子,(2)可选取代的羟基,(3)可选取代的
氨基等;R3和R4各自代表氢原子等;R5代表氢原子等;R6代表可选取代的羟基等;R7和R8各自代表可选取代的烃基等;R9和R10各自代表(1)氢原子等;Y代表可选取代的亚甲基基团;n代表0或1,或其盐,具有优异的
磷酸二酯酶IV抑制作用。