Fused tetra or penta-cyclic dihydrodiazepinocarbazolones as PARP inhibitors

1. A compound of Formula (I):

or a stereoisomer or a pharmaceutically acceptable salt thereof,

wherein:

R N is hydrogen or alkyl, wherein the alkyl is optionally substituted with at least one of hydroxyl or C 1 -C 12 alkoxyl;

X is C or N;

m and n are each 1 or 2;

t is 0 or 1;

R 1 at each occurrence, is independently selected from halogen, CN, NO 2 , OR 9 , NR 9 R 10 , NR 9 COR 10 , NR 9 SO 2 R 10 , CONR 9 R 10 , COOR 9 , SO 2 R 9 , alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl;

R 2 is hydrogen or alkyl;

R 3 , R 4 , R 5 , R 6 , R 7 and R 8 , which may be the same or different, are each independently selected from hydrogen, —OR 9 , —COR 9 , —CO 2 R 9 , alkyl, cycloalkyl, or aryl,

or (R 3 and R 4 ), and/or (R 4 and R 5 ), and/or (R 5 and R 6 ), and/or (R 6 and R 7 ), and/or (R 7 and R 8 ), together with the atom(s) they are attached, form a 3- to 8-membered saturated, partially or fully unsaturated ring having 0, 1 or 2 heteroatoms independently selected from —NR 13 —, —O—, —S—, —SO— or —SO 2 —;

provided that when X is N, R 6 is absent,

R 9 and R 10 , which may be the same or different, are each selected from hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl;

R 13 is selected from hydrogen, alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl,

wherein the cycloalkyl is a hydrocarbon group selected from saturated and partially unsaturated cyclic hydrocarbon groups, comprising monocyclic, bicyclic and tricyclic groups, and comprising from 3 to 12 carbon atoms;

wherein the heteroaryl is a group selected from:

5- to 7-membered aromatic, monocyclic rings comprising at least one heteroatom selected from N, O, and S, with the remaining ring atoms being carbon;

8- to 12-membered bicyclic rings comprising at least one heteroatom selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in the aromatic ring; and

11- to 14-membered tricyclic rings comprising at least one heteroatom selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in an aromatic ring; and

wherein the heterocyclyl is a ring selected from 4- to 12-membered monocyclic, bicyclic and tricyclic, saturated and partially unsaturated rings, comprising at least one carbon atoms in addition to at least one heteroatom selected from oxygen, sulfur, and nitrogen.

2. The compound according to claim 1 , which is a compound of Formula (II):

or a stereoisomer or a pharmaceutically acceptable salt thereof,

wherein:

R N is selected from hydrogen or alkyl, wherein the alkyl is optionally substituted with at least one of hydroxyl or C 1 -C 12 alkoxyl;

m and n are each 1 or 2;

t is 0 or 1;

R 1 , at each occurrence, is independently selected from halogen, CN, NO 2 , OR 9 , NR 9 R 10 , NR 9 COR 10 , NR 9 SO 2 R 10 , CONR 9 R 10 , COOR 9 , SO 2 R 9 , alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl, wherein each of the alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl is independently optionally substituted with at least one substituent R 12 ;

R 2 is selected from hydrogen, COR 9 , CONR 9 R 10 , CO 2 R 9 , SO 2 R 9 , alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl;

R 3 , R 4 , R 5 , R 6 , R 7 and R 8 , which may be the same or different, are each independently selected from hydrogen, —OR 9 , —COR 9 , —CO 2 R 9 , alkyl, cycloalkyl, or aryl,

or (R 3 and R 4 ), and/or (R 4 and R 5 ), and/or (R 5 and R 6 ), and/or (R 6 and R 7 ), and/or (R 7 and R 8 ), together with the atom(s) to which they are attached, form a 3- to 8-membered saturated, partially or fully unsaturated ring having 0, 1 or 2 heteroatoms independently selected from —NR 13 —, —O—, —S—, —SO— and —SO 2 —;

R 9 and R 13 , which may be the same or different, are each selected from hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl; and

R 13 is selected from hydrogen, alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl.

3. The compound according to claim 1 , which is a compound of Formula (III):

or a stereoisomer or a pharmaceutically acceptable salt thereof,

wherein:

R N is hydrogen or alkyl, wherein the alkyl is optionally substituted with at least one of hydroxyl or C 1 -C 12 alkoxyl;

X is C or N;

m and n are each 1 or 2;

t is 0 or 1;

R 1 , at each occurrence, is independently selected from halogen, CN, NO 2 , OR 9 , NR 9 R 10 , NR 9 COR 10 , NR 9 SO 2 R 10 , CONR 9 R 10 , COOR 9 , SO 2 R 9 , alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl;

R 2 is hydrogen or alkyl;

R 3 , R 4 , R 5 , R 7 and R 8 , which may be the same or different, are each independently selected from hydrogen, —OR 9 , —COR 9 , —CO 2 R 9 , alkyl, cycloalkyl, or aryl,

or (R 3 and R 4 ), and/or (R 4 and R 5 ), and/or (R 5 and R 7 ), and/or (R 7 and R 8 ), together with the atom(s) they are attached, form a 3- to 8-membered saturated, partially or fully unsaturated ring having 0, 1 or 2 heteroatoms independently selected from —NR 13 —, —O—, —S—, —SO—, and —SO 2 —;

R 9 and R 10 , which may be the same or different, are each selected from hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl; and

R 13 is selected from hydrogen, alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl.

4. A pharmaceutical composition comprising at least one pharmaceutically acceptable carrier and as an active ingredient a therapeutically effective amount of the compound of claim 1 .

5. The compound of claim 3 , wherein t is 1.

6. The compound of claim 3 , wherein R 1 is halogen or alkyl.

7. The compound of claim 6 , wherein R 1 is F.

8. The compound of claim 3 , wherein R 4 and R 5 together with the atoms to which they are attached, form a 5-membered saturated ring having one nitrogen.

9. The compound of claim 3 , wherein R N is hydrogen.

10. The compound of claim 3 , wherein R 3 is hydrogen.