Pharmaceutical composition for treating alzheimer's disease

1. A method for treating Alzheimer's disease, comprising:

administering a composition in an amount effective for treating Alzheimer's disease to a subject in need thereof,

wherein the composition comprises a compound represented by the general formula (I):

wherein ring A is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group,

wherein Alk 1 is lower alkylene or lower alkenylene;

R 0 is a hydrogen atom, lower alkyl, or acyl;

X is S or O;

R 2a and R 2b are each independently a hydrogen atom, hydroxy, optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted amino, optionally substituted amidino, optionally substituted acyl, optionally substituted carbamoyl, optionally substituted carbamoylcarbonyl, optionally substituted lower alkylsulfonyl, optionally substituted arylsulfonyl, an optionally substituted carbocyclic group, or an optionally substituted heterocyclic group;

R 3a , R 3b , R 4a , and R 4b are each independently a hydrogen atom, halogen, hydroxy, optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted acyl, carboxy, optionally substituted lower alkoxycarbonyl, optionally substituted amino, optionally substituted carbamoyl, an optionally substituted carbocyclic group, or an optionally substituted heterocyclic group;

n and m are each independently an integer of 0 to 3;

n+m is 3;

each R 3a , each R 3b , each R 4a , and each R 4b may be independently different;

R 5 is a hydrogen atom, optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted lower alkynyl, an optionally substituted carbocyclic group, or an optionally substituted heterocyclic group;

R 5 and ring A can be taken together to form

wherein R 5a and R 5b are each independently a hydrogen atom or lower alkyl;

s is an integer of 1 to 4; and

each R 5a and each R 5b may be different,

its pharmaceutically acceptable salt, or a solvate thereof as an active ingredient.

2. The method for treating Alzheimer's disease according to claim 1 , wherein n is 3 and m is 0.

3. The method for treating Alzheimer's disease according to claim 1 , wherein E is a bond.

4. The method for treating Alzheimer's disease according to claim 1 , wherein R 5 is optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted lower alkynyl, an optionally substituted carbocyclic group, or an optionally substituted heterocyclic group.

5. The method for treating Alzheimer's disease according to claim 1 , wherein each of R 2a and R 2b is a hydrogen atom.

6. The method for treating Alzheimer's disease according to claim 1 , wherein ring A is optionally substituted phenyl.

7. The method for treating Alzheimer's disease according to claim 1 , wherein ring A is represented by the formula:

wherein R 9 , R 10 , and R 11 are each independently a hydrogen atom, halogen, hydroxy, cyano, nitro, mercapto, optionally substituted lower alkyl, optionally substituted lower alkoxy, optionally substituted lower alkenyl, optionally substituted lower alkynyl, optionally substituted acyl, optionally substituted acyloxy, carboxy, optionally substituted lower alkoxycarbonyl, optionally substituted lower alkoxycarbonyloxy, optionally substituted lower aryloxycarbonyloxy, optionally substituted amino, optionally substituted carbamoyl, optionally substituted carbamoyloxy, optionally substituted lower alkylthio, optionally substituted arylthio, optionally substituted lower alkylsulfonyl, optionally substituted arylsulfonyl, optionally substituted lower alkyl sulfinyl, optionally substituted arylsulfinyl, optionally substituted lower alkylsulfonyloxy, optionally substituted arylsulfonyloxy, optionally substituted sulfamoyl, an optionally substituted carbocyclic group, optionally substituted carbocyclicoxy, an optionally substituted heterocyclic group, or optionally substituted heterocyclicoxy;

G is halogen, hydroxy, cyano, nitro, mercapto, optionally substituted lower alkyl, optionally substituted lower alkoxy, optionally substituted lower alkenyl, optionally substituted lower alkynyl, optionally substituted acyl, optionally substituted acyloxy, carboxy, optionally substituted lower alkoxycarbonyl, optionally substituted lower alkoxycarbonyloxy, optionally substituted lower aryloxycarbonyloxy, optionally substituted amino, optionally substituted carbamoyl, optionally substituted carbamoyloxy, optionally substituted lower alkylthio, optionally substituted arylthio, optionally substituted lower alkylsulfonyl, optionally substituted arylsulfonyl, optionally substituted lower alkyl sulfinyl, optionally substituted arylsulfinyl, optionally substituted lower alkylsulfonyloxy, optionally substituted arylsulfonyloxy, optionally substituted sulfamoyl, an optionally substituted carbocyclic group, optionally substituted carbocyclicoxy, an optionally substituted heterocyclic group, or optionally substituted heterocyclicoxy.

8. The method for treating Alzheimer's disease according to claim 7 , wherein R 9 , R 10 , and R 11 are each independently a hydrogen atom, halogen, optionally substituted lower alkyl or optionally substituted lower alkoxy.

9. The method for treating Alzheimer's disease according to claim 7 , wherein G is represented by the formula:

wherein R 12 is a hydrogen atom, lower alkyl, hydroxy lower alkyl, lower alkoxy lower alkyl, lower alkoxycarbonyl lower alkyl, carbocyclic lower alkyl, or acyl;

ring B is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group.

10. The method for treating Alzheimer's disease according to claim 9 , wherein ring B is aryl optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, optionally substituted lower alkyl, optionally substituted lower alkoxy, optionally substituted acyl, optionally substituted amino, cyano, optionally substituted carbamoyl, an optionally substituted carbocyclic group, optionally substituted carbocyclicoxy, and an optionally substituted heterocyclic group or heteroaryl optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, optionally substituted lower alkyl, optionally substituted lower alkoxy, optionally substituted acyl, optionally substituted amino, cyano, optionally substituted carbamoyl, an optionally substituted carbocyclic group, optionally substituted carbocyclicoxy, and an optionally substituted heterocyclic group.

11. The method for treating Alzheimer's disease according to claim 1 , wherein R 5 is C1 to C3 alkyl.

12. The method for treating Alzheimer's disease according to claim 1 , wherein R 5 is methyl.

13. The method for treating Alzheimer's disease according to claim 1 , wherein R 3a and R 3b are each independently a hydrogen atom, halogen, hydroxy, optionally substituted lower alkyl, optionally substituted lower alkoxy, or optionally substituted aryl.

14. The method for treating Alzheimer's disease according to claim 1 , wherein all of R 3a and all of R 3b are hydrogen atoms.