The present invention provides an indanone derivative and an excellent sigma receptor binding agent comprising an indanone derivative. More specifically, it provides a sigma receptor binding agent comprising an indanone derivative represented by the following formula, a pharmacologically acceptable salt thereof or a hydrate of them.
In the formula (I), R 1 , R 2 , R 3 and R 4 are the same as or different from each other and each represents hydrogen atom, a halogen atom, hydroxyl group, nitrile group, a C 1-6 alkyl group which may be substituted, a cycloalkyl group having three to eight carbon atoms which may be substituted, a C 1-6 alkoxy group which may be substituted, a cycloalkoxy group having three to eight carbon atoms which may be substituted, an acyl group having one to six carbon atoms which may be substituted, a C 1-6 alkoxycarbonyl group which may be substituted, a C 1-6 alkylaminocarbonyloxy group which may be substituted, a di(C 1-6 alkyl)aminocarbonyloxy group which may be substituted, nitro group, an amino group which may be substituted, an amido group which may be substituted, mercapto group or a thio-C 1-6 alkoxy group which may be substituted, and further R 1 with R 2 , R 2 with R 3 , or R 3 with R 4 may together form an aliphatic ring, an aromatic ring, a heterocyclic ring or an alkylenedioxy ring; the partial structure:
represents a group represented by >CH-CH 2 -, >C=CH- or >C(-R 7 )-CH 2 -; m represents an integer of 0 or 1 to 5; and R 5 represents hydrogen atom, a C 1-6 alkyl group which may be substituted, a C 2-6 alkenyl group which may be substituted, a C 2-6 alkynyl group which may be substituted, a cycloalkyl group having three to eight carbon atoms which may be substituted, a 2,2-(alkylenedioxy)ethyl group or a group represented by the formula:
(wherein the ring C represents benzene ring, an aliphatic ring or a heterocyclic ring; R 6 s are the same as or different from each other and each represents hydrogen atom, a halogen atom, hydroxyl group, nitrile group, a C 1-6 alkyl group which may be substituted, a C 2-6 alkenyl group which may be substituted, a C 2-6 alkynyl group which may be substituted, a cycloalkyl group having three to eight carbon atoms which may be substituted, a C 1-6 alkoxy group which may be substituted, a C 1-6 alkoxyalkoxy group which may be substituted, an aryloxy group which may be substituted or an aralkyloxy group which may be substituted, and further two of R 6 s may together form an aliphatic ring, an aromatic ring, a heterocyclic ring or an alkylenedioxy ring; R 7 represents a halogen atom, hydroxyl group, a C 1-6 alkyl group which may be substituted, a C 1-6 alkoxy group, nitrile group, a halogeno-C 1-6 alkyl group, a hydroxyl-C 1-6 alkyl group, a cyano-C 1-6 alkyl group, an amino-C 1-6 alkyl group, nitro group, azide group, an amino group which may be substituted, a carbamoyl group which may be substituted, a carboxyl group which may be substituted, mercapto group or a thio-C 1-6 alkoxy group; and n represents an integer of 1 to 5), provided that 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methylpiperidine, a pharmacologically acceptable salt thereof or a hydrate of them are excluded.