The present invention provides a compound represented by the formula
wherein A represents (1) a bond, (2) a group represented by the formula -CRa=CRb- (Ra and Rb each represent a hydrogen atom or C1-6 alkyl) and the like; R1 represents (1) cyano or (2) an optionally esterified or amidated carboxyl group; R2 represents
(1) a hydrogen atom, (2) an optionally substituted hydroxy group,
(3) an optionally substituted amino group and the like; R3 and R4 each represent a hydrogen atom and the like; R5 represents a hydrogen atom and the like; R6 represents an optionally substituted hydroxy group and the like; R7and R8 each represent an optionally substituted hydrocarbon group and the like; R9 and R10 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,其表示为式中的化合物,其中A代表(1)键,(2)由式 -CRa=CRb-(Ra和Rb分别代表
氢原子或C1-6烷基等)表示的基团等;R1代表(1)
氰基或(2)可选择
酯化或
酰胺化的羧基;R2代表(1)
氢原子,(2)可选择取代的羟基,(3)可选择取代的
氨基等;R3和R4各自代表
氢原子等;R5代表
氢原子等;R6代表可选择取代的羟基等;R7和R8各自代表可选择取代的
碳氢基团等;R9和R10各自代表(1)
氢原子等;Y代表可选择取代的亚
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。