The object of the present invention is to provide a compound and a pharmaceutical composition having excellent Syk inhibitory activity. According to the present invention, a nicotinamide derivative represented by the following formula (I) or a salt thereof is provided,
wherein
R1 is a substituent represented by the following formula (II-1), (III-1), or (IV-1)
(wherein R3, R4, R5, n, and X1 have the same definitions as those described in the specification), and R2 is a pyridyl, indazolyl, phenyl, pyrazolopyridyl, benzisoxazolyl, pyrimidinyl, or quinolyl group, each of which optionally has at least one substituent.
本发明的目的是提供一种具有优异Syk抑制活性的化合物和药物组合物。根据本发明,提供了一种由以下式(I)表示的烟酰胺衍
生物或其盐,其中R1是由以下式(II-1),(III-1)或(IV-1)表示的取代基(其中R3、R4、R5、n和X1的定义与规范中描述的相同),而R2是
吡啶基,
吲哚基,苯基,
吡唑吡啶基,苯并
异噁唑基,
嘧啶基或
喹啉基,每种基团都可以选择至少一个取代基。