Imidazopyridine inhibitors of iap

Abstract

The invention provides novel inhibitors of IAP that are useful as therapeutic agents for treating malignancies where the compounds have the general formula I: wherein Q, X 1 , X 2 , Y, Z R 1 , R 2 , R 3 , R 3 ′, R 4 , R 4 ′, R 5 , R 6 , R 6 ′ and n are as described herein.

1 . A compound of formula (I) 
       
         
           
           
               
               
           
         
       
       wherein
 X 1  and X 2  are each independently O or S; 
 Y is a bond, (CR 7 R 7 ) m , O or S; 
 Z is H, alkyl, a carbocycle or a heterocycle; wherein said alkyl, carbocycle and heterocycle is optionally substituted with one or more hydroxyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, optionally substituted alkyl, amino, cyano, nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle; and wherein one or more CH 2  or CH groups of an alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)—; 
 Q is H, halogen, hydroxyl, carboxyl, amino, nitro, cyano, alkyl, a carbocycle or a heterocycle; wherein said alkyl, carbocycle and heterocycle is optionally substituted with one or more hydroxyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, optionally substituted alkyl, amino, cyano, nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle; and wherein one or more CH 2  or CH groups of an alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)—; 
 R 1  is H, OH or alkyl; or R 1  and R 2  together form a 5-8 member heterocycle; 
 R 2  is alkyl, a carbocycle, carbocyclylalkyl, a heterocycle or heterocyclylalkyl each optionally substituted with halogen, hydroxyl, oxo, thione, mercapto, carboxyl, alkyl, haloalkyl, acyl, alkoxy, alkylthio, sulfonyl, amino and nitro, wherein said alkyl, acyl, alkoxy, alkylthio and sulfonyl are optionally substituted with hydroxy, mercapto, halogen, amino, alkoxy, hydroxyalkoxy and alkoxyalkoxy; 
 R 3  is H or alkyl optionally substituted with halogen or hydroxyl; or R 3  and R 4  together form a 3-6 heterocycle; 
 R 3 ′ is H, or R 3  and R 3 ′ together form a 3-6 carbocycle; 
 R 4  and R 4 ′ are independently H, hydroxyl, amino, alkyl, carbocycle, carbocycloalkyl, carbocycloalkyloxy, carbocycloalkyloxycarbonyl, heterocycle, heterocycloalkyl, heterocycloalkyloxy or heterocycloalkyloxycarbonyl; wherein each alkyl, carbocycloalkyl, carbocycloalkyloxy, carbocycloalkyloxycarbonyl, heterocycle, heterocycloalkyl, heterocycloalkyloxy and heterocycloalkyloxycarbonyl is optionally substituted with halogen, hydroxyl, mercapto, carboxyl, alkyl, alkoxy, amino, imino and nitro; or R 4  and R 4 ′ together form a heterocycle; 
 R 5  is H or alkyl; 
 R 6 , and R 6 ′ are each independently H, alkyl, aryl or aralkyl; 
 R 7  is H, cyano, hydroxyl, mercapto, halogen, nitro, carboxyl, amidino, guanidino, alkyl, a carbocycle, a heterocycle or —U—V; wherein U is —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)— and V is alkyl, a carbocycle or a heterocycle; and wherein one or more CH 2  or CH groups of an alkyl is optionally replaced with —O—, —S—, —S(O)—, —S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —C(O)—O— or —O—C(O)—; and an alkyl, carbocycle and heterocycle is optionally substituted with hydroxyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, halo-substituted alkyl, amino, cyano nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle; 
 R 8  is H, alkyl, a carbocycle or a heterocycle wherein one or more CH 2  or CH groups of said alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 ), or —C(O)—; and said alkyl, carbocycle and heterocycle is optionally substituted with hydroxyl, alkoxy, acyl, halogen, mercapto, oxo (═O), carboxyl, acyl, halo-substituted alkyl, amino, cyano nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle; and 
 m is 0 to 4. 
 
     
     
         2 . The compound of  claim 1 , wherein Z is H, halogen or alkyl. 
     
     
         3 . The compound of  claim 1 , wherein Y is CH 2 . 
     
     
         4 . The compound of  claim 1 , wherein Q is a carbocycle or heterocycle optionally substituted with alkyl, a carbocycle or a heterocycle; wherein any alkyl, carbocycle or heterocycle is optionally substituted with halogen, amino, hydroxyl, mercapto, carboxyl, alkoxy, alkoxyalkoxy, hydroxyalkoxy, alkylthio, acyloxy, acyloxyalkoxy, alkylsulfonyl, alkylsulfonylalkyl, alkylsulfinyl, and alkylsulfinylalkyl; and wherein one or more CH 2  or CH groups of any foregoing alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)—; 
     
     
         5 . The compound of  claim 1 , wherein Q is a carbocycle or heterocycle selected from the group consisting of IIIa-IIIs: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein n is 1-4; T is O, S, NR 8  or CR 7 R 7 ; and W is O, NR 8  or CR 7 R 7 . 
       
     
     
         6 . The compound of  claim 1 , wherein R 1  is H. 
     
     
         7 . The compound of  claim 1 , wherein R 2  is alkyl, cycloalkyl or a heterocycle. 
     
     
         8 . The compound of  claim 1 , wherein R 2  is selected from the group consisting of t-butyl, isopropyl, cyclohexyl, tetrahydropyran-4-yl, N-methylsulfonylpiperidin-4-yl, tetrahydrothiopyran-4-yl, tetrahydrothiopyran-4-yl (in which the S is in oxidized form SO or SO 2 ), cyclohexan-4-one, 4-hydroxycyclohexane, 4-hydroxy-4-methylcyclohexane, 1-methyl-tetrahydropyran-4-yl, 2-hydroxyprop-2-yl, but-2-yl, thiophen-3-yl, piperidin-4-yl, N-acetylpiperidin-4-yl, N-hydroxyethylpiperidin-4-yl, N-(2-hydroxyacetyl)piperidin-4-yl, N-(2-methoxyacetyl)piperidin-4-yl, pyridin-3-yl, phenyl and 1-hydroxyeth-1-yl. 
     
     
         9 . The compound of  claim 1 , wherein R 3  is methyl. 
     
     
         10 . The compound of  claim 1 , wherein R 4  is H or methyl, and R 4 ′ is H. 
     
     
         11 . The compound of  claim 1 , wherein R 5  is H. 
     
     
         12 . The compound of  claim 1 , wherein R 6  and R 6 ′ are both H. 
     
     
         13 . The compound of  claim 1 , wherein X 1  and X 2  are both O. 
     
     
         14 . The compound of  claim 2 , wherein R 1  is H; R 2  is isopropyl, t-butyl, cyclohexyl or pyran; R 3  is methyl; R 3 ′ is H; R 4  is methyl, R 4 ′ is H; R 5  is H; X 1  and X 2  are both O; and R 6  and R 6 ′ are both H. 
     
     
         15 . A method of inducing apoptosis in a cell comprising introducing into said cell a compound of  claim 1 . 
     
     
         16 . A method of sensitizing a cell to an apoptotic signal comprising introducing into said cell a compound of  claim 1 . 
     
     
         17 . The method of  claim 16 , wherein said apoptotic signal is induced by contacting said cell with a compound selected from the group consisting of cytarabine, fludarabine, 5-fluoro-2′-deoxyuiridine, gemcitabine, methotrexate, bleomycin, cisplatin, cyclophosphamide, adriamycin (doxorubicin), mitoxantrone, camptothecin, topotecan, colcemid, colchicine, paclitaxel, vinblastine, vincristine, tamoxifen, finasteride, taxotere and mitomycin C or radiation. 
     
     
         18 . The method of  claim 16 , wherein said apoptotic signal is induced by contacting said cell with Apo2L/TRAIL. 
     
     
         19 . A method for inhibiting the binding of an IAP protein to a caspase protein comprising contacting said IAP protein with a compound of  claim 1 . 
     
     
         20 . A method for treating a disease or condition associated with the overexpression of an IAP in a mammal, comprising administering to said mammal an effective amount of a compound of  claim 1 . 
     
     
         21 . A method for treating cancer, comprising administering to said mammal an effective amount of a compound of  claim 1 .