Hsp90 family protein inhibitors

1. A benzoyl compound represented by general formula (IA):

{wherein

nA represents an integer of 1 to 5;

R 1A represents substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkoxy, substituted or unsubstituted cycloalkyl, substituted or unsubstituted lower alkoxycarbonyl, substituted or unsubstituted heterocyclic alkyl, substituted or unsubstituted aryl, CONR 7 R 8 (wherein R 7 and R 8 independently represent a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted lower alkanoyl, substituted or unsubstituted aryl, a substituted or unsubstituted heterocyclic group, substituted or unsubstituted aralkyl, substituted or unsubstituted heterocyclic alkyl, or substituted or unsubstituted aroyl, or R 7 and R 8 form a substituted or unsubstituted heterocyclic group together with the adjacent nitrogen atom) or NR 9 R 10 (wherein R 9 and R 10 have the same meanings as the above R 7 and R 8 , respectively);

R 2A represents substituted or unsubstituted aryl;

R 3A , R 4A and R 5A each represent a hydrogen atom; and

R 6A represents halogen or lower alkyl, and

wherein (i) substituents in the substituted lower alkyl, the substituted lower alkoxy and the substituted lower alkoxycarbonyl are 1 to 3 substituents which are the same or different selected from the group (A) consisting of hydroxy, oxo, cyano, nitro, carboxy, amino, halogen, substituted or unsubstituted lower alkoxy, cycloalkyl, lower alkanoyl, lower alkoxycarbonyl, lower alkylamino and di-lower alkylamino, wherein substituents in said substituted lower alkoxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy and halogen, and

(ii) substituents in the substituted cycloalkyl, the substituted heterocyclic alkyl, the substitued aryl, the substituted lower alkanoyl, the substituted heterocyclic group, the substituted aralkyl, the substituted aroyl and the substituted heterocyclic group formed together with the adjacent nitrogen atom are 1 to 3 substituents which are the same or different selected from the group (B) consisting of hydroxy, halogen, nitro, cyano, amino, carboxy, carbamoyl, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkoxy, aralkyloxy, lower alkylsulfonyl, lower alkylsulfanyl, cycloalkyl, lower alkoxycarbonyl, lower alkylamino, di-lower alkylamino, lower alkanoyl, a heterocyclic group, substituted or unsubstituted aryl, substituted or unsubstituted heterocyclic alkyloxy and substituted or unsubstituted heterocyclic carbonylalkyloxy, wherein substituents in said substituted lower alkyl, said substituted lower alkoxy and said substituted aryl are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkoxy, cyano, lower alkylamino and di-lower alkylamino, and substituents in said substituted heterocyclic alkyloxy and said substituted heterocyclic carbonylalkyloxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkyl, lower alkoxy and a heterocyclic group},

or a pharmaceutically acceptable salt thereof.

2. The benzoyl compound according to claim 1 , wherein R 2A aryl substituted by 1 to 3 substituents which are the same or different selected from the group (B), or a pharmaceutically acceptable salt thereof.

3. The benzoyl compound according to claim 1 or 2 , wherein R 1A is CONR 7 R 8 , or a pharmaceutically acceptable salt thereof.

4. The benzoyl compound according to claim 1 or 2 , wherein R 6A is lower alkyl, or a pharmaceutically acceptable salt thereof.

5. A pharmaceutical composition comprising, as an active ingredient, the benzoyl compound according to claim 4 or a pharmaceutically acceptable salt of said benzoyl compound, together with a pharmaceutically acceptable carrier.

6. The benzoyl compound according to claim 1 , wherein

nA is 1,

R 1A is CONR 7a R 8a (wherein R 7a and R 8a independently represent lower alkyl substituted by hydroxy or lower alkoxy), and

R 6A is lower alkyl,

or a pharmaceutically acceptable salt thereof.

7. The benzoyl compound according to claim 6 , wherein R 2A is

(wherein R 2a represents substituted or unsubstituted lower alkoxy, and R 2b represents substituted or unsubstituted heterocyclic alkyloxy, wherein substituents in said substituted lower alkoxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkoxy, cyano, lower alkylamino and di-lower alkylamino, and substituents in said substituted heterocyclic alkyloxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkyl, lower alkoxy and a heterocyclic group), or a pharmaceutically acceptable salt thereof.

8. The benzoyl compound according to claim 6 , wherein R 2A is

(wherein R represents substituted or unsubstituted lower alkoxy, and R 2b represents substituted or unsubstituted heterocyclic alkyloxy, wherein substituents in said substituted lower alkoxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkoxy, cyano, lower alkylamino and di-lower alkylamino, and substituents in said substituted heterocyclic alkyloxy are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkyl, lower alkoxy and a heterocyclic group), or a pharmaceutically acceptable salt thereof.

9. The benzoyl compound according to claim 6 wherein R 2A is

(wherein R represents substituted or unsubstituted morpholino or substituted or unsubstituted piperidino, wherein substituents in said substituted morpholino and said substituted piperidino are 1 to 3 substituents which are the same or different selected from the group consisting of hydroxy, halogen, lower alkyl, lower alkoxy and a heterocyclic group), or a pharmaceutically acceptable salt thereof.

10. A pharmaceutical composition comprising, as an active ingredient, the benzoyl compound according to either one of claims 1 or 2 , or a pharmaceutically acceptable salt of said benzoyl compound, together with a pharmaceutically acceptable carrier.

11. A pharmaceutical composition comprising, as an active ingredient, the benzoyl compound according to claim 3 , or a pharmaceutically acceptable salt of said benzoyl compound, together with a pharmaceutically acceptable carrier.

12. A pharmaceutical composition comprising, as an active ingredient, the benzoyl compound according to any one of claims 6 to 9 , or a pharmaceutically acceptable salt of said benzoyl compound, together with a pharmaceutically acceptable carrier.