Substituted piperazine compounds and methods of use thereof

1. A compound having Formula (I) or a stereoisomer, a tautomer, an N-oxide, a solvate, a metabolite, a pharmaceutically acceptable salt or a prodrug thereof,

wherein

X is

wherein U 4 is CR 2 or N;

p is 1, 2 or 3;

W is —NH—, —O— or —S—;

each L 1 is —CR 3 R 4 —;

each L 2 is —CR 5 R 6 —;

t is 0, 1 or 2;

r is 1, 2, 3, 4 or 5;

q is 1, 2, 3 or 4;

Y is

wherein Q is O, S or N(R 7 );

each of and is independently a single bond or a double bond;

each of X 1 , X 2 , X 3 and X 4 is independently —O—, —S—, CR 8 , N, —CR 8 R 8a — or —NR 8b —;

or X 1 and X 2 together or X 3 and X 4 together independently form —CR 8 R 8a —, —NR 8b —, —O— or —S—;

each R 1 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , alkyl, alkenyl or alkynyl, wherein each of alkyl, alkenyl and alkynyl is optionally and independently substituted with one or more R 9 ;

each R 2 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , —S(═O) m R c , —C(═O)R c , —C(═O)OR c , —C(═O)NR a R b , —S(═O) 2 NR a R b , —OC(═O)R c , —N(R a )C(═O)R c , alkyl, alkenyl or alkynyl, wherein each of alkyl, alkenyl and alkynyl is optionally and independently substituted with one or more R 9 ;

each R 3 and R 4 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NH 2 , —OH, alkyl, alkenyl, alkynyl, alkoxy, alkylamino, cycloalkyl, heterocyclyl, aryl or heteroaryl, or R 3 and R 4 , together with the carbon atom to which they are attached, form a carbonyl group, a carbocyclic ring or a heterocyclic ring, wherein each of alkyl, alkenyl, alkynyl, alkoxy, alkylamino, cycloalkyl, heterocyclyl, aryl, heteroaryl, the carbocyclic ring and the heterocyclic ring is optionally and independently substituted with one or more R 9 ;

each R 5 and R 6 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NH 2 , —OH, alkyl, alkenyl, alkynyl, alkoxy, alkylamino, cycloalkyl, heterocyclyl, aryl or heteroaryl, or R 5 and R 6 , together with the carbon atom to which they are attached, form a carbocyclic ring or a heterocyclic ring, wherein each of alkyl, alkenyl, alkynyl, alkoxy, alkylamino, cycloalkyl, heterocyclyl, aryl, heteroaryl, the carbocyclic ring and the heterocyclic ring is optionally and independently substituted with one or more R 9 ;

R 7 is H, —OH, —NH 2 , C 1 -C 4 alkyl, C 1 -C 4 haloalkyl or C 1 -C 4 alkylamino;

each R 8 , R 8a and R 8b is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —(C 0 -C 6 alkylene)-NR a R b , —(C 0 -C 6 alkylene)-OR c , —(C 0 -C 6 alkylene)-S(═O) m R c , —C(═O)R c , —C(═O)OR c , —C(═O)NR a R b , —S(═O) 2 NR a R b , —OC(═O)R c , —N(R a )C(═O)R c , alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl or heteroaryl;

or two R 8 on two adjacent ring atoms, or two R 8b on two adjacent ring atoms, or R 8 and R 8b on two adjacent ring atoms, together with the ring atoms to which they are attached, independently form a carbocyclic ring, a heterocyclic ring, an aryl ring or a heteroaryl ring, wherein each of the carbocyclic ring, the heterocyclic ring, the aryl ring and the heteroaryl ring is optionally and independently substituted with one or more substituents independently selected from R x and R y ;

each R 9 is independently F, Cl, Br, I, —CN, —N 3 , —NO 2 , —OH, —SH, —NH 2 , alkyl, haloalkyl, alkoxy, alkylthio or alkylamino;

each R x and R y is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , —SR c , —C(═O)NR a R b , —C(═O)OR c , —O—(C 0 -C 6 alkylnene)-C(═O)NR a R b , —O—(C 0 -C 6 alkylene)-C(═O)OR c , alkyl or haloalkyl;

each R a and R b is independently H, alkyl, alkenyl, alkynyl, haloalkyl, —(C 0 -C 6 alkylene)-cycloalkyl, —(C 0 -C 6 alkylene)-heterocyclyl, —(C 0 -C 6 alkylene)-aryl or —(C 0 -C 6 alkylene)-heteroaryl, or R a and R b , together with the nitrogen atom to which they are attached, form a heterocyclic ring;

each R c is independently H, alkyl, alkenyl, alkynyl, haloalkyl, —(C 0 -C 6 alkylene)-cycloalkyl, —(C 0 -C 6 alkylene)-heterocyclyl, —(C 0 -C 6 alkylene)-aryl or —(C 0 -C 6 alkylene)-heteroaryl; and

each m is independently 0, 1 or 2.

2. The compound according to claim 1 , wherein each R 1 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl, wherein each of C 1 -C 6 alkyl, C 2 -C 6 alkenyl and C 2 -C 6 alkynyl is optionally and independently substituted with one or more R 9 ; or each R 1 is independently H, D, F, Cl, Br, —CN, —NO 2 , —OR c or C 1 -C 4 alkyl, wherein the C 1 -C 4 alkyl is optionally substituted with one or more R 9 ;

each R 2 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , —S(═O) m R c , —C(═O)R c , —C(═O)OR c , —C(═O)NR a R b , —S(═O) 2 NR a R b , —OC(═O)R c , —N(R a )C(═O)R c , C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl, wherein each of C 1 -C 6 alkyl, C 2 -C 6 alkenyl and C 2 -C 6 alkynyl is optionally and independently substituted with one or more R 9 ; or each R 2 is independently H, D, F, Cl, Br, —CN, —NO 2 , —NR a R b , —OR c , —C(═O)OR c , —C(═O)NR a R b or C 1 -C 4 alkyl, wherein the C 1 -C 4 alkyl is optionally substituted with one or more R 9 ;

each R 3 and R 4 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NH 2 , —OH, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, C 3 -C 10 cycloalkyl, 3-10 membered heterocyclyl, C 6 -C 10 aryl or 5-10 membered heteroaryl, or R 3 and R 4 , together with the carbon atom to which they are attached, form a carbonyl group, a C 3 -C 8 carbocyclic ring or a 3-7 membered heterocyclic ring, wherein each of C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, C 3 -C 10 cycloalkyl, 3-10 membered heterocyclyl, C 6 -C 10 aryl, 5-10 membered heteroaryl, the C 3 -C 8 carbocyclic ring and the 3-7 membered heterocyclic ring is optionally and independently substituted with one or more R 9 ;

each R 5 and R 6 is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NH 2 , —OH, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, C 3 -C 10 cycloalkyl, 3-10 membered heterocyclyl, C 6 -C 10 aryl or 5-10 membered heteroaryl, or R 5 and R 6 , together with the carbon atom to which they are attached, form a C 3 -C 8 carbocyclic ring or a 3-7 membered heterocyclic ring, wherein each of C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, C 3 -C 10 cycloalkyl, 3-10 membered heterocyclyl, C 6 -C 10 aryl, 5-10 membered heteroaryl, C 3 -C 8 carbocyclic ring and 3-7 membered heterocyclic ring is optionally and independently substituted with one or more R 9 ; and

each R 9 is independently F, Cl, Br, I, —CN, —N 3 , —NO 2 , —OH, —SH, —NH 2 , C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylthio or C 1 -C 6 alkylamino.

3. The compound according to claim 1 , wherein each R 8 , R 8a , and R 8b is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —(C 0 -C 6 alkylene)-NR a R b , —(C 0 -C 6 alkylene)-OR c , —(C 0 -C 6 alkylene)-S(═O) m R c , —C(═O)R c , —C(═O)OR c , —C(═O)NR a R b , —S(═O) 2 NR a R b , —OC(═O)R c , —N(R a )C(═O)R c , C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 10 cycloalkyl, 3-10 membered heterocyclyl, C 6 -C 10 aryl or 5-10 membered heteroaryl;

or two R 8 on two adjacent ring atoms, or two R 8b on two adjacent ring atoms, or R 8 and R 8b on two adjacent ring atoms, together with the ring atoms to which they are attached, independently form a C 3 -C 10 carbocyclic ring, a 3-10 membered heterocyclic ring, a C 6 -C 10 aryl ring or a 5-10 membered heteroaryl ring, wherein each of the C 3 -C 10 carbocyclic ring, the 3-10 membered heterocyclic ring, the C 6 -C 10 aryl ring and the 5-10 membered heteroaryl ring is optionally and independently substituted with one or more substituents independently selected from R x and R y ; or

wherein each R 8 , R 8a and R 8b is independently H, D, F, Cl, Br, —CN, —NO 2 , —(C 0 -C 4 alkylene)-OR c , —(C 0 -C 4 alkylene)-NR a R b , —C(═O)OR c , —C(═O)NR a R b , C 1 -C 4 alkyl, C 2 -C 4 alkenyl or C 2 -C 4 alkynyl;

or two R 8 on two adjacent ring atoms, or two R 8b on two adjacent ring atoms, or R 8 and R 8b on two adjacent ring atoms, together with the ring atoms to which they are attached, independently form a C 3 -C 8 carbocyclic ring, a 3-7 membered heterocyclic ring, a benzene ring or a 5-6 membered heteroaryl ring, wherein each of the C 3 -C 8 carbocyclic ring, the 3-7 membered heterocyclic ring, the benzene ring and the 5-6 membered heteroaryl ring is optionally and independently substituted with one or more substituents independently selected from R x and R y .

4. The compound according to claim 1 , wherein each R x and R y is independently H, D, F, Cl, Br, I, —CN, —N 3 , —NO 2 , —NR a R b , —OR c , —SR c , —C(═O)NR a R b , —C(═O)OR c , —O—(C 0 -C 6 alkylnene)-C(═O)NR a R b , —O—(C 0 -C 6 alkylene)-C(═O)OR c , C 1 -C 6 alkyl or C 1 -C 6 haloalkyl; or

wherein each R x and R y is independently H, D, F, Cl, Br, —CN, —NO 2 , —NR a R b , —OR c , —SR c , —C(═O)NR a R b , —C(═O)OR c , —O—(C 0 -C 4 alkylnene)-C(═O)NR a R b , —O—(C 0 -C 4 alkylene)-C(═O)OR c , C 1 -C 4 alkyl or C 1 -C 4 haloalkyl.

5. The compound according to claim 1 having Formula (II) or a stereoisomer, a tautomer, an N-oxide, a solvate, a metabolite, a pharmaceutically acceptable salt or a prodrug thereof,

wherein p is 1, 2 or 3; and

r is 1, 2, 3 or 4.

6. The compound according to claim 2 , wherein each R 1 is independently H, D, F, Cl, Br, —CN, —NO 2 , -Me, —CF 3 or —OMe; and

each R 2 is independently H, D, F, Cl, Br, —CN, —NO 2 , —NH 2 , —NMe 2 , —OH, —OMe, —O(i-Pr), -Me, -Et, -(i-Pr), —CF 3 , —C(═O)OH, —C(═O)OMe or —CONH 2 .

7. The compound according to claim 1 , wherein each L 1 is —CH 2 —, —C(═O)— or —CH(OH)—.

8. The compound according to claim 1 , wherein Y is

wherein each X 1 , X 2 , X 3 and X 4 is independently —O—, —S— or —NR 8b —; and

each n is independently 1, 2, 3 or 4.

9. The compound according to claim 8 , wherein Y is

wherein each A 1 , A 2 , A 3 and A 4 is independently —O—, —S—, —NR y — or —CHR x —; and

each A 5 , A 6 , A 7 and A 8 is independently N or CR x .

10. The compound according to claim 3 , wherein each R 8 , R 8a and R 8b is independently H, D, F, Cl, Br, —CN, —NO 2 , —OH, —NH 2 , —C(═O)OMe, —C(═O)OEt, —C(═O)NH 2 , -Me, -Et, -(i-Pr), —OMe, —O(i-Pr) or —NMe 2 .

11. The compound according to claim 4 , wherein each R x and R y is independently H, D, F, Cl, Br, —CN, —NO 2 , —OH, —OMe, —NH 2 , —NMe 2 , —COOH, —C(═O)OMe, —C(═O)OEt, —C(═O)NH 2 , —OCH 2 COOH, —OCH 2 C(═O)OMe, —OCH 2 C(═O)OEt, —OCH 2 C(═O)NH 2 , -Me, -Et, -(i-Pr) or —CF 3 .

12. The compound according to claim 1 , wherein each R a and R b is independently H, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 haloalkyl, —(C 0 -C 4 alkylene)-(C 3 -C 8 cycloalkyl), —(C 0 -C 4 alkylene)-(3-7 membered heterocyclyl), —(C 0 -C 4 alkylene)-(phenyl) or —(C 0 -C 4 alkylene)-(5-6 membered heteroaryl), or R a and R b , together with the nitrogen atom to which they are attached, form a 3-7 membered heterocyclic ring; and

each R c is independently H, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 haloalkyl, —(C 0 -C 4 alkylene)-(C 3 -C 8 cycloalkyl), —(C 0 -C 4 alkylene)-(3-7 membered heterocyclyl), —(C 0 -C 4 alkylene)-(phenyl) or —(C 0 -C 4 alkylene)-(5-6 membered heteroaryl).

13. The compound according to claim 1 having one of the following structures:

or a stereoisomer, a tautomer, an N-oxide, a solvate, a metabolite, a pharmaceutically acceptable salt or a prodrug thereof.

14. A pharmaceutical composition comprising the compound according to claim 1 , and optionally further comprising a pharmaceutically acceptable excipient, carrier, adjuvant or a combination thereof.

15. The pharmaceutical composition according to claim 14 further comprising an additional therapeutic agent for central nervous system dysfunction, wherein the additional therapeutic agent is an antidepressant, an antianxiety agent, a lithium agent of a mood stabilizer, an atypical antipsychotic agent, an antiepileptic agent, an anti-Parkinson agent, a selective serotonin reuptake inhibitor, a 5-HT 1A receptor agonist, a central nervous system stimulant, a nicotine antagonist or a combination thereof; or

wherein the additional therapeutic agent is amitriptyline, desipramine, mirtazapine, bupropion, reboxetine, fluoxetine, trazodone, sertraline, duloxetine, fluvoxamine, milnacipran, levomilnacipran, desvenlafaxine, vilazodone, venlafaxine, dapoxetine, nefazodone, femoxetine, clomipramine, citalopram, escitalopram, paroxetine, lithium carbonate, buspirone, olanzapine, quetiapine, risperidone, ziprasidone, aripiprazole, perospirone, clozapine, modafinil, mecamylamine, cabergoline, adamantane, imipramine, pramipexole, thyroxine, dextromethorphan, quinidine, naltrexone, samidorphan, buprenorphine, melatonin, alprazolam, pipamperone, vestipitant, chlordiazepoxide, perphenazine or a combination thereof.

16. A method of lessening the severity of a central nervous system dysfunction through selectively inhibiting serotonin reuptake in a subject comprising administrating a therapeutically effective amount of the compound according to claim 1 to the subject.

17. A method of inhibiting serotonin reuptake with the compound according to claim 1 .

18. A method of partially activating 5-HT 1A receptor with the compound according to claim 1 .

19. A method of lessening the severity of a central nervous system dysfunction through selectively inhibiting serotonin reuptake activity in a subject comprising administrating a therapeutically effective amount of the pharmaceutical composition according to claim 14 to the subject.

20. A method of inhibiting serotonin reuptake with the pharmaceutical composition according to claim 14 .

21. A method of partially activating 5-HT 1A receptor with the pharmaceutical composition according to claim 14 .