PROBLEM TO BE SOLVED: To provide a therapeutic drug and/or prophylactic drug for pains or a therapeutic drug and/or prophylactic drug for diseases mediated by sodium channels.SOLUTION: The provided compound is expressed by the formula (I): [Ar denotes a heteroaryl group or aryl group R1 denotes a C1-C6 alkyl group, halogenated C1-C6 alkyl group, C1-C6 alkoxy-C1-C6 alkyl group, or C3-C7 cycloalkyl group R2 and R3 are mutually independent and each denote a hydrogen atom, halogen atom, C1-C6 alkyl group, halogenated C1-C6 alkyl group, C1-C6 alkoxy-C1-C6 alkyl group, or C3-C7 cycloalkyl group in the above, the heteroaryl group and aryl group may each possess one or two groups selected independently from among halogen atoms, C1-C6 alkyl groups, halogenated C1-C6 alkyl groups, hydroxyl group, C1-C6 alkoxy-C1-C6 alkyl groups, C3-C7 cycloalkyl groups, carboxyl group, cyano group, and amino group, and in a case where the number is 2, the respective groups may be mutually identical or different].COPYRIGHT: (C)2014,JPO&INPIT【課題】痛みの治療薬及び/又は予防薬、あるいはナトリウムチャネルが介在する疾病の治療薬及び/又は予防薬の提供。【解決手段】式(I)の化合物:[Arは、ヘテロアリール基、又はアリール基;R1は、C1-C6アルキル基、ハロゲン化C1-C6アルキル基、C1-C6アルコキシC1-C6アルキル基、又はC3-C7シクロアルキル基;R2及びR3は、各々独立に、水素原子、ハロゲン原子、C1-C6アルキル基、ハロゲン化C1-C6アルキル基、C1-C6アルコキシC1-C6アルキル基、又はC3-C7シクロアルキル基;ここで、ヘテロアリール基及びアリール基は、ハロゲン原子、C1-C6アルキル基、ハロゲン化C1-C6アルキル基、水酸基、C1-C6アルコキシC1-C6アルキル基、C3-C7シクロアルキル基、カルボキシ基、シアノ基、アミノ基]【選択図】なし
