Fused heterocyclic compounds as ion channel modulators

1. A compound of Formula X:

wherein:

n is 0, 1, 2, 3, 4 or 5;

R 10 is independently selected from the group consisting of halo, —NO 2 , —CN, —SF 5 , —Si(CH 3 ) 3 , —O—R 20 , —S—R 20 , —C(O)—R 20 , —C(O)—OR 20 , —N(R 20 )(R 22 ), —C(O)—N(R 20 )(R 22 ), —N(R 20 )—C(O)—R 22 , —N(R 20 )—C(O)—OR 22 , —N(R 20 )—S(O) 2 —R 26 , —S(O) 2 —R 2 , —O—S(O) 2 —R 20 , —S(O) 2 —N(R 20 )(R 22 ), C 1-6 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, cycloalkyl, aryl, heteroaryl and heterocyclyl; and

wherein said C 1-6 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, cycloalkyl, aryl, heteroaryl or heterocyclyl are optionally substituted with one, two or three substituents independently selected from the group consisting of halo, —NO 2 , aryl, heterocyclyl, heteroaryl, C 1-6 alkyl, C 1-3 haloalkyl, cycloalkyl, —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R)(R 22 ), —CN and —O—R 20 ;

R 2 is —C 1-6 alkylene-R 5 , -L-R 5 , -L-C 1-6 alkylene-R 5 , —C 1-6 alkylene-L-R 5 or —C 1-6 alkylene-L-C 1-6 alkylene-R 5 ;

L is —O—, —S—, —C(O)—, —NHS(O) 2 —, —S(O) 2 NH—, —C(O)NH— or —NHC(O)—, provided that when R 2 is -L-R 5 or -L-C 1-6 alkylene-R 5 , then L is not —O—, —S—, —NHS(O) 2 — or —NHC(O)—;

each R 4 is independently hydrogen, deuterium, C 1-6 alkyl, —C(O)—OR 26 , —C(O)—N(R 26 )(R 26 ), cycloalkyl, aryl, heteroaryl or heterocyclyl;

wherein said C 1-6 alkyl is optionally substituted with one, two or three substituents independently selected from the group consisting of halo, —NO 2 , cycloalkyl, aryl, heterocyclyl, heteroaryl, —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN and —O—R 20 ;

wherein said cycloalkyl, aryl, heterocyclyl or heteroaryl are optionally further substituted with one, two or three substituents independently selected from the group consisting of halo, —NO 2 , C 1-6 alkyl, aralkyl, cycloalkyl, aryl, heterocyclyl, heteroaryl, —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN and —O—R 20 ; and

wherein said C 1-6 alkyl, aralkyl, cycloalkyl, aryl, heterocyclyl, heteroaryl, are optionally further substituted with one, two or three substituents independently selected from the group consisting of hydroxyl, halo, —NO 2 , —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN and —O—R 20 ;

or two R 4 together with the carbon atom to which they are attached form an oxo;

R 5 is cycloalkyl, aryl, heteroaryl or heterocyclyl;

wherein said cycloalkyl, aryl, heteroaryl or heterocyclyl are optionally substituted with one, two or three substituents independently selected from the group consisting of C 1-6 alkyl, C 2-4 alkynyl, halo, —NO 2 , cycloalkyl, aryl, heterocyclyl, heteroaryl, —N(R 20 )(R 22 ), —N(R 20 )—S(O) 2 —R 20 , —N(R 20 )—C(O)—R 22 , —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN, oxo and —O—R 20 ;

wherein said C 1-6 alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl are optionally further substituted with one, two or three substituents independently selected from the group consisting of halo, —NO 2 , C 1-6 alkyl, cycloalkyl, aryl, heterocyclyl, heteroaryl, —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN and —O—R 20 ; and

wherein said C 1-6 alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl are optionally further substituted with one, two or three substituents independently selected from the group consisting of halo, aryl, —NO 2 , —CF 3 , —N(R 20 )(R 22 ), —C(O)—R 20 , —C(O)—OR 20 , —C(O)—N(R 20 )(R 22 ), —CN, —S(O) 2 —R 20 and —O—R 20 ;

R 6 is hydrogen or C 1-6 alkyl;

R 20 and R 22 are in each instance independently selected from the group consisting of hydrogen, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, cycloalkyl, heterocyclyl, aryl and heteroaryl;

wherein the C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, cycloalkyl, heterocyclyl, aryl and heteroaryl are optionally substituted with one, two or three substituents independently selected from the group consisting of hydroxyl, halo, C 1-4 alkyl, acylamino, oxo, —NO 2 , —S(O) 2 R 26 , —CN, C 1-3 alkoxy, —CF 3 , —OCF 3 , —OCH 2 CF 3 , —C(O)—NH 2 , aryl, cycloalkyl and heteroaryl; and

wherein said heteroaryl is optionally further substituted with C 1-4 alkyl or cycloalkyl; or

when R 20 and R 22 are attached to a common nitrogen atom R 20 and R 22 may join to form a heterocyclic or heteroaryl ring which is then optionally substituted with one, two or three substituents independently selected from the group consisting of hydroxyl, halo, C 1-4 alkyl, aralkyl, aryloxy, aralkyloxy, acylamino, —NO 2 , —S(O) 2 R 26 , —CN, C 1-3 alkoxy, —CF 3 , —OCF 3 , aryl, heteroaryl and cycloalkyl; and

each R 26 is independently selected from the group consisting of hydrogen, C 1-4 alkyl, aryl and cycloalkyl;

wherein the C 1-4 alkyl, aryl and cycloalkyl may be further substituted with from 1 to 3 substituents independently selected from the group consisting of hydroxyl, halo, C 1-4 alkoxy, —CF 3 and —OCF 3 ;

or a pharmaceutically acceptable salt, ester, stereoisomer, mixture of stereoisomers or tautomer thereof.

2. The compound of claim 1 , wherein R 2 is

3. The compound of claim 1 , wherein R 10 is 4-trifluoromethyl or 4-trifluoromethoxy.

4. The compound of claim 1 , wherein each R 4 is independently hydrogen,

deuterium or C 1-6 alkyl optionally substituted with heteroaryl, or two R 4 together with the carbon atom to which they are attached form an oxo.

5. The compound of claim 1 , wherein R 6 is hydrogen or methyl.

6. A compound selected from the group consisting of:

4-(2-(benzyloxy)ethyl)-1-methyl-7-(4-(trifluoromethoxy)phenyl)-3,4-dihydro-1H-benzo[e][1,4]diazepine-2,5-dione (X-7);

4-benzyl-7-(4-(trifluoromethyl)phenyl)-3,4-dihydro-1H-benzo[e][1,4]diazepine-2,5-dione (X-8);

4-benzyl-1-methyl-7-(4-(trifluoromethyl)phenyl)-3,4-dihydro-1H-benzo[e][1,4]diazepine-2,5-dione (X-11); and

5-benzyl-8-(4-(trifluoromethyl)phenyl)-4H-benzo[f]imidazo[1,2-a][1,4]diazepin-6(5H)-one (X-12);

or a pharmaceutically acceptable salt, ester, stereoisomer, mixture of stereoisomers or tautomer thereof.

7. A pharmaceutical composition comprising a pharmaceutically acceptable excipient and a therapeutically effective amount of the compound of claim 1 or a pharmaceutically acceptable salt, thereof.

8. A method of treating a disease state in a human that is alleviable by treatment with an agent capable of reducing late sodium current, comprising administering to a human in need thereof a therapeutically effective dose of a compound of claim 1 .

9. The method of claim 8 , wherein the disease state is selected from the group consisting of atrial arrhythmias, ventricular arrhythmias, heart failure diastolic heart failure, systolic heart failure, acute heart failure, stable angina, unstable angina, exercise induced angina, congestive heart disease, ischemia, recurrent ischemia, reperfusion injury, myocardial infarction, acute coronary syndrome, peripheral arterial disease, pulmonary hypertension and intermittent claudication.

10. The method of 8 , wherein the disease state is diabetes or diabetic peripheral neuropathy.

11. The method of 8 , wherein the disease state results in one or more of neuropathic pain, epilepsy, migraine, seizures or paralysis.