Spirochromanon derivatives

The compound, or a salt thereof, wherein the compound is represented by a general formula (I-1):

• wherein Ar1 represents a group formed from an aromatic ring selected from a group consisting of benzene, pyrazole, isoxazole, pyridine, indole, 1H-indazole, 1H-furo[2,3-c]pyrazole, 1H-thieno[2,3-c]pyrazole, benzimidazole, 1,2-benzisoxazole, imidazo[1,2-a]pyridine, imidazo[1,5-a]pyridine and 1H-pyrazolo[3,4-b]pyridine, having Ar2, and optionally having one or two or more substituents selected from R3;
• Ar2 represents an aromatic group selected from a group consisting of a phenyl group, a furyl group, a thienyl group, a pyrazolyl group, a thiazolyl group, an oxazolyl group, an isoxazolyl group, a 1,2,4-triazolyl group, a 1,2,4-oxadiazolyl group, a 1,3,4-oxadiazolyl group, a tetrazolyl group, a pyridyl group, a pyrazinyl group, a pyrimidinyl group, an indolyl group and a benzo[b]thienyl group, optionally having a substituent selected from a group consisting of a halogen atom, a nitro group, a cyano group, a hydroxyl group, a C1-C6 alkyl group, a halo-C1-C6 alkyl group, a hydroxy-C1-C6 alkyl group, a cyclo-C3-C6 alkyl group, a C2-C6 alkenyl group, a C1-C6 alkoxy group, a halo-C1-C6 alkoxy group, a C1-C6 alkylthio group, a C2-C7 alkanoylamino group, a C1-C6 alkylcarbamoyl group, a cyclo-C3-C6 alkylcarbamoyl group, a (C1-C6 alkoxy-C1-C6 alkyl)carbamoyl group, a C1-C6 alkoxycarbonyl group, a C1-C6 alkylsulfonyl group, a C1-C6 alkylsulfonylamino group and a tetrazolyl group;
• R1 represents a group of -Q1-N(Ra)-Q2-Rb;
• or heterocyclic group optionally having a substituent selected from a group consisting of a halogen atom, a hydroxyl group, an oxo group, a thioxo group, a C1-C6 alkyl group, a halo-C1-C6 alkyl group, a hydroxy-C1-C6 alkyl group, a C2-C7 alkanoyloxy-C1-C6 alkyl group, a C1-C6 alkoxy group, a halo-C1-C6 alkoxy group, a formyl group, a carboxyl group, a C2-C7 alkanoyl group, a C2-C7 alkoxycarbonyl group, a C1-C6 alkylsulfonyl group and a group of —CO—N(Rc)Rd;
• or a C1-C6 alkyl group or a C2-C6 alkenyl group having the aryl or heterocyclic group;
• R20 represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group or a C1-C6 alkoxy group;
• R3 represents a halogen atom, a nitro group, a cyano group, a hydroxyl group, a carboxyl group, a C2-C6 alkenyl group, a cyclo-C3-C6 alkyl group, or a group of —N(Re)Rf;
• a phenoxy group, a C1-C6 alkoxy group, a C2-C7 alkoxycarbonyl group, a C1-C6 alkylthio group, a cyclo-C3-C6 alkyloxy group, a cyclo-C3-C6 alkyloxycarbonyl group, a cyclo-C3-C6 alkyl-C1-C6 alkoxy group, a cyclo-C3-C6 alkylthio group or a cyclo-C3-C6 alkyl-C1-C6 alkylthio group, optionally substituted with a halogen atom or a hydroxyl group, wherein the cyclo-C3-C6 alkyl group in the cyclo-C3-C6 alkyloxy group, the cyclo-C3-C6 alkyloxycarbonyl group, the cyclo-C3-C6 alkyl-C1-C6 alkoxy group, the cyclo-C3-C6 alkylthio group or the cyclo-C3-C6 alkyl-C1-C6 alkylthio group may be interrupted by an oxygen atom, a sulfur atom or an imino group;
• a C1-C6 alkyl group optionally having a substituent selected from a group consisting of a halogen atom, a hydroxyl group, a cyclo-C3-C6 alkyl group and a C1-C6 alkoxy group;
• or
• a phenyl group, a 1,2,4-triazolyl group or a tetrazolyl group optionally having a substituent selected from a group consisting of a halogen atom, a nitro group, a hydroxyl group, a C1-C6 alkyl group, a halo-C1-C6 alkyl group, a hydroxy-C1-C6 alkyl group, a cyclo-C3-C6 alkyl group, a C2-C6 alkenyl group, a C1-C6 alkoxy group, a halo-C1-C6 alkoxy group and a C1-C6 alkylthio group;
• Q1 and Q2 are a single bond, Ra is a hydrogen atom, and Rb is a heteroaromatic group optionally substituted with a C1-C6 alkyl group optionally having a substituent selected from a group consisting of a halogen atom, a C1-C6 alkoxy group, a carbamoyl group and a C2-C7 alkoxycarbonyl group;
• Rc, and Rd, each independently represent a hydrogen atom, a C1-C6 alkyl group, or a halo-C1-C6 alkyl group;
• Re and Rf each independently represent a hydrogen atom, a C1-C6 alkyl group, or a halo-C1-C6 alkyl group, or taken together, they may form a C2-C5 alkylene group optionally interrupted by an oxygen atom, a sulfur atom or an imino group;
• and
• U represents a methine group.