Substituted imidazoquinolines

1. A compound of formula I

wherein

R 1 is selected from the group consisting of:

alkyl, alkynyl, aryl, alkoxy, heterocyclyl and heteroaryl,

which alkyl, alkynyl, aryl, alkoxy, heterocyclyl or heteroaryl is unsubstituted or substituted by one or more substituents;

A is C 1 -C 6 alkyl;

B is —N(R 2 )(R 3 );

R 2 is H or —(CO)—R 5 ;

R 5 is selected from the group consisting of:

alkyl, cycloalkyl, alkynyl, and heterocyclyl,

each of which is unsubstituted or substituted by one or more substituents;

R 3 is heterocyclyl,

which heterocyclyl is unsubstituted or substituted by one or more substituents;

or a pharmaceutically acceptable solvate, salt, N-oxide or stereoisomer thereof,

wherein at least one of the following conditions i to iv is satisfied:

i) R 2 is —(CO)—R 5 ;

ii) A is not propyl;

iii) R 1 is not butyl;

iv) R 3 does not encompass substituted piperidyl.

2. The compound of formula I according to claim 1 , wherein R 3 is heterocyclyl, which is unsubstituted or substituted by one or more substituents selected from group consisting of: —H, alkyl, alkenyl, alkoxy, halogen, —OH, —N 3 , trifluromethyl, -alkyl-aryl, —O-alkyl-aryl, —CO-aryl, aryl, heterocyclyl, heteroaryl, CO-heteroaryl, —CO-substituted aryl, CO-substituted heteroaryl, —CO—O-alkyl, —CO—N-alkyl, and —CO—N-aryl.

3. The compound of formula I according to claim 1 , wherein R 1 is selected from the group consisting of alkyl, alkynyl, aryl, alkoxy, heterocyclyl and heteroaryl, each of which is optionally substituted by one or more substituents which are selected from the group consisting of: —H, —OH, halogen, —CO—N(R 4 ) 2 , —N(R 4 ) 2 , —CO—C 1-10 alkyl, —CO—O—C 1-10 alkyl, —N 3 , optionally substituted aryl, heterocyclyl and —CO-aryl, wherein each R 4 is independently —H, —C 1-10 alkyl, —C 1-10 alkyl-aryl, or aryl.

4. The compound of formula I according to claim 1 , wherein R 5 is substituted by one or more substituents which are selected from the group consisting of: —H, —OH, halogen, —CN, —NO 2 , —COOH, —SH, —CO—C 1-6 alkyl, —CO—O—C 1-6 alkyl, —N 3 , optionally substituted aryl, heterocyclyl, —CO-aryl and —CO-heterocyclyl.

5. The compound of formula I according to claim 1 , wherein R 3 is heterocyclyl, which is unsubstituted or substituted by one or more substituents which are selected from group consisting of: —H, alkyl, alkenyl, halogen and —OH.

6. The compound of formula I according to claim 1 , wherein R 3 is selected from the group consisting of: dioxo-tetrahydrothiophenyl, tetrahydrofuranyl, tetrahydropyranyl and azabicyclooctanyl, each of which is optionally substituted by one or more groups.

7. The compound of formula I according to claim 1 , wherein R 1 is alkyl.

8. The compound of formula I according claim 1 , wherein R 5 is alkyl.

9. A compound, which is:

N-[4-(4-amino-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]-N-(1,1-dioxidotetrahydro-3-thienyl)acetamide,

N-[4-(4-amino-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]-N-(1-methyl-1-oxidopiperidin-4-yl)acetamide,

3-{acetyl[4-(4-amino-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]amino}-2,5-anhydro-1,3,4-trideoxypentitol,

N-[4-(4-amino-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)butyl]-N-(1-benzyl-2-methyl-1-oxidopyrrolidin-3-yl)acetamide,

2-ethyl-1-[4-(tetrahydro-2H-pyran-4-ylamino)butyl]-1H-imidazo[4,5-c]quinolin-4-amine, 1-[4-(1-azabicyclo[2.2.2]oct-3-ylamino)butyl]-2-ethyl-1H-imidazo[4,5-c]quinolin-4-amine or 1-{4-[(1,1-dioxido-3,4-dihydro-2H-thiochromen-4-yl)amino]butyl}-2-ethyl-1H-imidazo[4,5-c]quinolin-4-amine,

or a pharmaceutically acceptable solvate, salt, N-oxide or stereoisomer thereof.

10. A pharmaceutical composition comprising a compound of formula I as claimed in claim 1 in combination with a pharmaceutically acceptable carrier.

11. A pharmaceutical composition comprising a compound of formula I as claimed in claim 1 or a pharmaceutically acceptable solvate, salt, N-oxide or stereoisomer thereof in combination with a pharmaceutically acceptable carrier sufficient to provide a dose of about 100 ng/kg to about 50 mg/kg of the compound to a subject to whom the pharmaceutical composition is administered.

12. The compound of formula I according to claim 1 , wherein R 1 is ethyl.

13. The compound of formula I according to claim 1 , wherein R 5 is methyl.

14. A compound of formula I according to claim 1 :

wherein

R 1 is selected from the group consisting of:

alkyl, alkynyl, aryl, alkoxy, heterocyclyl and heteroaryl,

which alkyl, alkynyl, aryl, alkoxy, heterocyclyl or heteroaryl is unsubstituted or substituted by one or more substituents selected from the group consisting of: —H, —OH, halogen, —CO—N(R 4 ) 2 , —N(R 4 ) 2 , —CO—C 1-10 alkyl, —CO—O—C 1-10 alkyl, —N 3 , optionally substituted aryl, heterocyclyl and —CO-aryl,

wherein each R 4 is independently —H, —C 1-10 alkyl, —C 1-10 alkyl-aryl, or aryl;

A is C 1 -C 6 alkyl;

B is —N(R 2 )(R 3 );

R 2 is H or —(CO)—R 5 ;

R 5 is selected from the group consisting of:

alkyl, cycloalkyl, alkynyl, and heterocyclyl,

each of which is unsubstituted or substituted by one or more substituents selected from the group consisting of: —H, —OH, halogen, —CN, —NO 2 , —COOH, —SH, —CO—C 1-6 alkyl, —CO—O—C 1-6 alkyl, —N 3 , optionally substituted aryl, heterocyclyl, —CO-aryl and —CO-heterocyclyl;

R 3 is heterocyclyl,

which heterocyclyl is unsubstituted or substituted by one or more substituents selected from group consisting of: —H, alkyl, alkenyl, alkoxy, halogen, —OH, —N 3 , trifluromethyl, -alkyl-aryl, —O-alkyl-aryl, —CO-aryl, aryl, heterocyclyl, heteroaryl, CO-heteroaryl, —CO-substituted aryl, CO-substituted heteroaryl, —CO—O-alkyl, —CO—N-alkyl, and —CO—N-aryl;

or a pharmaceutically acceptable solvate, salt, N-oxide or stereoisomer thereof, wherein at least one of the following conditions i to iv is satisfied:

i) R 2 is —(CO)—R 5 ;

ii) A is not propyl;

iii) R 1 is not butyl;

iv) R 3 is not substituted piperidyl.

15. The compound of formula I according to claim 1 , wherein only condition ii) is satisfied.

16. The compound of formula I according to claim 1 , wherein only condition iii) is satisfied.

17. The compound of formula I according to claim 1 , wherein only condition iv) is satisfied.

18. The compound of formula I according to claim 1 , wherein only condition i) is satisfied.

19. The compound of formula I according to claim 1 , or a pharmaceutically acceptable salt thereof.

20. The compound of claim 9 , or a pharmaceutically acceptable salt thereof.

21. The compound of formula I according to claim 1 , wherein R 2 is H.

22. The compound of formula I according to claim 14 , wherein R 2 is H.