1,3-thiazol-2-yl substituted benzamides

1. A compound of general formula (I):

wherein:

R 1 is a halogen atom, C 1 -C 4 -alkyl or C 3 -C 6 -cycloalkyl,

wherein said C 1 -C 4 -alkyl is optionally substituted with 1-5 halogen atoms which are the same or different;

R 2 is —C 2 -C 6 -alkyl-OR 4 , —(CH 2 ) q —(C 3 -C 7 -cycloalkyl), —(CH 2 ) q -(6- to 12-membered heterobicycloalkyl), —(CH 2 ) q -(4- to 7-membered heterocycloalkyl), —(CH 2 ) q -(5- to 10-membered heteroaryl) or —C 2 -C 6 -alkynyl,

wherein said —(CH 2 ) q —(C 3 -C 7 -cycloalkyl), —(CH 2 ) q -(6- to 12-membered heterobicycloalkyl) and —(CH 2 ) q -(4- to 7-membered heterocycloalkyl) are optionally substituted with one or more substituents which are the same or different, at any ring carbon atom and selected from the group consisting of C 1 -C 4 alkyl optionally substituted with 1-5 halogen atoms which are the same or different, a halogen atom, —NR a R b , COOR 5 and oxo (═O),

wherein any ring nitrogen atom, if present in said —(CH 2 ) q -(6- to 12-membered heterobicycloalkyl) and —(CH 2 ) q -(4- to 7-membered heterocycloalkyl), is independently substituted with R c ; and

wherein said —(CH 2 ) q -(5- to 10-membered heteroaryl) is optionally substituted with one or more substituents which are the same or different, and selected from the group consisting of C 1 -C 4 -alkyl optionally substituted with 1-5 halogen atoms which are the same or different, a halogen atom, —NR a R b and —COOR 5 ;

R 3 is hydrogen or C 1 -C 4 -alkyl optionally substituted with 1-5 halogen atoms which are the same or different;

R 4 and R 5 are independently hydrogen or C 1 -C 4 -alkyl;

R a and R b are independently hydrogen or C 1 -C 4 -alkyl;

R c is hydrogen, C 1 -C 4 -alkyl optionally substituted with 1-5 halogen atoms which are the same or different, —C(O)O—C 1 -C 4 -alkyl, or —C(O)—C 1 -C 4 -alkyl;

A is 5- to 10-membered heteroaryl which is optionally substituted with one or more substituents, which are the same or different, and selected from the group consisting of a halogen atom, C 1 -C 3 -alkyl, and C 1 -C 3 -alkoxy,

wherein said C 1 -C 3 -alkyl and C 1 -C 3 -alkoxy are optionally substituted with 1-5 halogen atoms which are the same or different; and

q is an integer of 0, 1, or 2,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

2. The compound according to claim 1 , which is of formula (Ia):

wherein A, R 1 , R 2 and R 3 are as defined in claim 1 ,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

3. The compound according to claim 1 , wherein

A is an optionally substituted 5- or 6-membered heteroaryl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

4. The compound according to claim 1 , wherein

R 1 is C 1 -C 4 -alkyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

5. The compound according to claim 1 , wherein

R 3 is C 1 -C 4 -alkyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

6. The compound according to claim 1 , wherein

R 2 is —C 2 -C 3 -alkyl-OR 4 , —CH 2 —(C 3 -C 4 -cycloalkyl), C 3 -C 4 -cycloalkyl, —(CH 2 ) q -(4- to 6-membered heterocycloalkyl), or —C 2 -C 4 -alkynyl,

wherein said —CH 2 —(C 3 -C4-cycloalkyl), C 3 -C 4 -cycloalkyl and —(CH 2 ) q -(4- to 6-membered heterocycloalkyl) are optionally substituted with one or more substituents which are the same or different, at any ring carbon atom, and

wherein any ring nitrogen atom, if present in said —(CH 2 ) q -(4- to 6-membered heterocycloalkyl), is independently substituted with R c ; and

q is an integer of 0,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

7. The compound according to claim 1 , wherein

A is an optionally substituted 5- or 6-membered heteroaryl; and

R 1 is C 1 -C 4 -alkyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

8. The compound according to claim 1 , wherein

A is an optionally substituted 5- or 6-membered heteroaryl; and

R 3 is C 1 -C 4 -alkyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

9. The compound according to claim 1 , wherein

A is an optionally substituted 5- or 6-membered heteroaryl;

R 1 is C 1 -C 4 -alkyl; and

R 3 is C 1 -C 4 -alkyl,

or an isomer, enantiomer, diastereorner, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

10. The compound according to claim 1 , wherein

A is an optionally substituted 5- or 6-membered heteroaryl;

R 1 is C 1 -C 4 -alkyl;

R 2 is —C 2 -C 3 -alkyl-OR 4 , —CH 2 —(C 3 -C 4 -cycloalkyl), C 3 -C 4 -cycloalkyl, —C 2 ) q -(4- to 6-membered heterocycloalkyl), or —C 2 -C 4 -alkynyl,

wherein said —CH 2 —(C 3 -C 4 -cycloalkyl), C 3 -C 4 -cycloalkyl and —(CH 2 ) q -(4- to 6-membered heterocycloalkyl) are optionally substituted with one or more substituents which are the same or different, at any ring carbon atom, and

wherein any ring nitrogen atom, if present in said —(CH 2 ) q -(4- to 6-membered heterocycloalkyl), is independently substituted with R c ;

R 3 is C 1 -C 4 -alkyl; and

q is an integer of 0,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

11. The compound according to claim 1 , wherein

A is 5- or 6-membered heteroaryl containing at least one or two nitrogen atom(s),

wherein said 5- or 6-membered heteroaryl is optionally substituted one or two times, identically or differently, with a substituent selected from the group consisting of a fluorine atom, a chlorine atom, C 1 -C 2 -alkyl optionally substituted with 1-5 fluorine atoms, and C 1 -C 2 -alkoxy optionally substituted with 1-5 fluorine atoms;

R 1 is methyl or ethyl;

R 2 is —C 2 -C 3 -alkyl-OR 4 , unsubstituted —CH 2 —(C 3 -C 4 -cycloalkyl), unsubstituted C 3 -C 4 -cycloalkyl, unsubstituted (CH 2 ) q -(4- to 6-membered heterocycloalkyl), or —C 2 -C 4 -alkynyl;

q is an integer of 0; and

R 3 is methyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

12. The compound according to claim 1 , wherein

A is pyrimidinyl, pyridazinyl, pyridinyl, pyrazinyl, thiazolyl or thiadiazolyl, each of which is optionally substituted,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

13. The compound according to claim 1 , wherein

A is CF 3 -pyrimidinyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

14. The compound according to claim 1 , wherein

R 2 is cyclopropylmethyl, tetrahydrofuran-3-yl, tetrahydrofuran-2-ylmethyl, tetrahydrofuran-3-ylmethyl, prop-2-yn-1-yl, but-2-yn-1-yl, oxetan-3-yl, tetrahydropyran-4-yl, tetrahydro-2H-pyran-4-ylmethyl, pyridin-4-yl, pyridin-3-yl, 1,3,4-thiadiazol-2-yl, 1,3-thiazol-2-yl, 2,2-dimethyl-2-methoxyethyl, methoxyethyl, piperidin-4-yl, pyrrolidin-3-yl or azetidin-3-yl, each of which is optionally substituted,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

15. The compound according to claim 1 , wherein

R 2 is unsubstituted tetrahydrofuran-3-yl or unsubstituted oxetan-3-yl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

16. The compound according to claim 1 , wherein

R 2 is —(CH 2 ) q -(4- to 6-membered heterocycloalkyl),

wherein said (CH 2 ) q -(4- to 6-membered heterocycloalkyl) is optionally substituted with one or more substituents which are the same or different, at any ring carbon atom, and

wherein any ring nitrogen atom, if present in said —(CH 2 ) q -(4- to 6-membered heterocycloalkyl), is independently substituted with R c ; and

q is an integer of 1,

or an isomer, enantiomer, diastereomer, racemate, hydrate_solvate, or salt thereof, or a mixture of any of the foregoing.

17. The compound according to claim 16 , wherein

R 2 is —(CH 2 ) q -morpholinyl substituted with R c ,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

18. The compound according to claim 17 , wherein

R 2 is (4-methylmorpholin-2-yl)methyl,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

19. The compound according to claim 1 , wherein

R 2 is —C 2 -C 4 -alkyl-OH; and

R 1 is halogen,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

20. The compound according to claim 1 , wherein

R 2 is 3-hydroxybutan 2-yl

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

21. The compound according to claim 16 , wherein

A is pyrimidinyl or pyridazinyl, each of which is optionally substituted with one or two substituents which are the same or different, and selected from the group consisting of a fluorine atom, a chlorine atom, C 1 -C 2 -alkyl optionally substituted with 1 to 5 fluorine atoms, and C 1 -C 2 -alkoxy optionally substituted with 1 to 5 fluorine atoms,

or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

22. The compound according to claim 1 , which is

Trans Isomer 2: 3-{[3-hydroxybutan-2-yl]oxy}-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide;

Trans Isomer 1: 3-{[3-hydroxybutan-2-yl]oxy}-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[6-(trifluoromethyl)pyridazin-3-yl]ethyl} benzamide;

Trans Isomer 1: 3-(5-chloro-1,3-thiazol-2-yl)-5-{[3-hydroxybutan-2-yl]oxy}-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide;

Cis Isomer 1: 3-(5-chloro-1,3-thiazol-2-yl)-5-{[3-hydroxybutan-2-yl]oxy)-N-{(1R)-1-[2-(trifluoromethy)pyrimidin-5-yl]ethyl} benzamide;

Cis Isomer 2: 3-(5-chloro-1,3-thiazol-2-yl)-5-{[3-hydroxybutan-2-yl]oxy}-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide;

Trans Isomer 2: 3-(5-chloro-1,3-thiazol-2-yl)-5-{[3-hydroxybutan-2-yl]oxy}-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide;

Cis Isomer 1: 3-[(-3-hydroxybutan-2-yl)oxy]-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[6-(trifluoromethyl)pyridazin-3-yl]ethyl} benzamide;

Cis Isomer 2: 3-[(-3-hydroxybutan-2-yl)oxy]-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[6-(trifluoromethyl)pyridazin-3-yl]ethyl} benzamide;

Cis Isomer 1: 3-[(3-hydroxybutan-2-yl)oxy]-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[2-(trifluormethyl)pyrimidin-5-yl]ethyl} benzamide; or

Cis Isomer 2: 3-[(3-hydroxybutan-2-yl)oxy]-5-(5-methyl-1,3-thiazol-2-yl)-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide

or a hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

23. The compound according to claim 22 , which is

Cis Isomer 1: 3-(5-chloro-1,3-thiazol-2-yl)-5-{[3-hydroxybutan-2-yl]oxy}-N-{(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl} benzamide

or a hydrate, solvate, or salt thereof, or a mixture of any of the foregoing.

24. The compound according to claim 1 or a salt thereof.

25. A pharmaceutical composition comprising the compound according to claim 1 , or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing, and a pharmaceutically acceptable diluent or carrier.

26. The pharmaceutical composition according to claim 25 , comprising the compound of formula (I) or a salt thereof.

27. A method of inhibiting P2X3 homomeric receptor in a patient in need thereof, comprising administering an effective amount of the compound according to claim 1 , or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing, to the patient.

28. The method according to claim 27 , comprising administering the compound of formula (I) or a salt thereof.

29. A method of treating a disease, condition, or disorder in a patient in need thereof, comprising administering an effective amount of the compound of claim 1 , or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing, to the patient, wherein the disease, condition, or disorder is bladder outlet obstruction, urinary incontinence, reduced bladder capacity, increased frequency of micturition, urge incontinence, stress incontinence, bladder hyperreactivity, benign prostatic hypertrophy, prostatic hyperplasia, detrusor hyperreflexia, overactive bladder, increased urinary frequency, nocturia, urinary urgency, urethritis, prostatitis, prostatodynia, cystitis, idiopathic bladder hypersensitivity, or hyperalgesia.

30. The method according to claim 29 , comprising administering the compound of formula (I) or a salt thereof.

31. A method of treating a disease, condition, or disorder in a patient in need thereof, comprising administering an effect amount of the compound according to claim 1 , or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing, to the patient, wherein the disease, condition, or disorder is endometriosis, dysmenorrhea, dyspareunia, dysuria, or dyschezia.

32. The method according to claim 31 , comprising administering the compound of formula (I) or a salt thereof.

33. A method of treating pain in a patient in need thereof, comprising administering an effective amount of the compound according to claim 1 , or an isomer, enantiomer, diastereomer, racemate, hydrate, solvate, or salt thereof, or a mixture of any of the foregoing, to the patient.

34. The method according to claim 33 , comprising administering the compound of formula (I) or a salt thereof.