Benzofuran derivative, preparation method thereof and use thereof in medicine

1. A compound of formula (I):

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof,

wherein:

ring A is selected from the group consisting of heterocyclyl and cycloalkyl;

each R 1 is identical or different and each is independently selected from the group consisting of hydrogen, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, amino, nitro, hydroxy, cyano, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 6 , —C(O) R 6 , —C(O)O R 6 , —S(O) m R 6 , —S(O) m NR 7 R 8 and —(CH 2 ) x R a , wherein the alkyl, haloalkyl, heterocyclyl, aryl and heteroaryl are each independently and optionally substituted by one or more groups selected from the group consisting of alkyl, haloalkyl, halogen, amino, nitro, cyano, hydroxy, alkoxy, haloalkoxy, hydroxyalkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl;

R a is selected from the group consisting of halogen, cycloalkyl, heterocyclyl and —NR 7 R 8 , wherein the cycloalkyl and heterocyclyl are each independently and optionally substituted by one or more groups selected from the group consisting of alkyl, haloalkyl, halogen, amino, nitro, cyano, hydroxy, alkoxy, haloalkoxy, hydroxyalkyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl;

R 2 is hydrogen or alkyl, wherein the alkyl is optionally substituted by one or more groups selected from the group consisting of halogen, hydroxy, cyano, cycloalkyl and heterocyclyl;

R 3 is selected from the group consisting of hydrogen, alkyl, halogen, cyano, alkoxy and haloalkyl;

each R 4 is identical or different and each is independently selected from the group consisting of hydrogen, alkyl, haloalkyl, hydroxy, amino, alkoxy, haloalkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 6 , —C(O)R 6 , —C(O)OR 6 , —S(O) m R 6 , —S(O) m NR 7 R 8 and —NR 7 R 8 ;

each R 5 is identical or different and each is independently selected from the group consisting of hydrogen, alkyl, oxo, halogen, haloalkyl, hydroxy, amino, alkoxy, haloalkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 6 , —C(O)R 6 , —C(O)OR 6 , —S(O) m R 6 , —S(O) m NR 7 R 8 and —NR 7 R 8 ;

R 6 is selected from the group consisting of hydrogen, alkyl, haloalkyl, alkoxy, hydroxyalkyl, hydroxy, amino, cycloalkyl, heterocyclyl, aryl and heteroaryl;

R 7 and R 8 are identical or different and each is independently selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyalkyl, hydroxy, amino, alkoxycarbonyl, cycloalkyl, heterocyclyl, aryl and heteroaryl, wherein the alkyl, amino, cycloalkyl, heterocyclyl, aryl and heteroaryl are each independently and optionally substituted by one or more groups selected from the group consisting of alkyl, halogen, hydroxy, amino, alkoxycarbonyl, nitro, cyano, alkoxy, hydroxyalkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl;

m is 0, 1 or 2;

n is 0, 1, 2 or 3;

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

q is 0, 1 or 2; and

x is 0, 1, 2 or 3.

2. The compound according to claim 1 , wherein n is 2.

3. The compound according to claim 1 , wherein p and q are each 0, 1 or 2.

4. The compound according to claim 1 , wherein each R 1 is identical or different and each is independently selected from the group consisting of hydrogen, halogen, alkyl, haloalkyl, cyano, cycloalkyl, heterocyclyl and —(CH 2 ) x R a , wherein the alkyl and heterocyclyl are each independently and optionally substituted by one or more groups selected from the group consisting of alkyl, hydroxyalkyl and halogen; and R a is selected from the group consisting of halogen, cycloalkyl, heterocyclyl and —NR 7 R 8 , wherein the cycloalkyl and heterocyclyl are each independently and optionally substituted by one or more groups selected from the group consisting of hydroxyalkyl, alkyl and halogen; and R 7 , R 8 and x are as defined in claim 1 .

5. The compound according to claim 1 , wherein each R 1 is identical or different and each is independently selected from the group consisting of hydrogen, alkyl, haloalkyl, cyano and —(CH 2 ) x R a , wherein x is 0, and R a is halogen or cycloalkyl.

6. The compound according to claim 1 , wherein R 2 is alkyl optionally substituted by cycloalkyl.

7. The compound according to claim 1 , wherein R 3 is selected from the group consisting of alkyl, halogen and haloalkyl.

8. The compound according to claim 1 , wherein each R 4 is identical or different and each is independently selected from the group consisting of hydrogen, alkyl and alkoxy.

9. The compound according to claim 1 , wherein each R 5 is identical or different and each is independently selected from the group consisting of hydrogen, halogen, oxo, haloalkyl, —C(O)R 6 , —S(O) m R 6 and —NR 7 R 8 .

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

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof,

wherein:

G is selected from the group consisting of CR b R c , C═O, NR d , S(O) m and oxygen;

R b and R c are each independently selected from the group consisting of hydrogen, alkyl, alkoxy, halogen, amino, hydroxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 6 , —C(O)R 6 , —C(O)OR 6 , —S(O) m R 6 and —NR 7 R 8 ;

R d is selected from the group consisting of hydrogen, alkyl, cycloalkyl, haloalkyl, heterocyclyl, aryl, heteroaryl, —C(O)R 6 , —C(O)OR 6 and —S(O) m R 6 ; and

R 1 to R 4 , R 6 to R 8 , n, m and q are as defined in claim 1 .

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

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof,

wherein:

E is CH or nitrogen;

F is selected from the group consisting of CR b R c , NR d and oxygen;

R b and R c are each independently selected from the group consisting of hydrogen, alkyl, alkoxy, halogen, amino, nitro, hydroxy, cyano, cycloalkyl, heterocyclyl, aryl and heteroaryl;

R d is selected from the group consisting of hydrogen, alkyl, cycloalkyl, haloalkyl, hydroxyalkyl, heterocyclyl, aryl and heteroaryl;

each R e is identical or different and each is independently selected from the group consisting of hydrogen, alkyl, haloalkyl, halogen, amino, nitro, cyano, hydroxy, alkoxy, haloalkoxy, hydroxyalkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl;

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

x is 0, 1, 2 or 3;

y is 0, 1, 2 or 3; and

R 2 to R 4 , and n are as defined in claim 1 .

12. The compound according to claim 11 , which is a compound of formula (IV):

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof,

wherein:

each R e is identical or different and each is independently selected from the group consisting of hydrogen, alkyl and halogen;

t is 0, 1, 2, 3, 4 or 5; and

R 2 to R 4 and n are as defined in claim 11 .

13. The compound according to claim 1 , which is a compound of formula (V):

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof,

wherein:

R e is selected from the group consisting of hydrogen, alkyl, haloalkyl, halogen, amino, nitro, cyano, hydroxy, alkoxy, haloalkoxy, hydroxyalkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl;

R 2 to R 4 and n are as defined in claim 1 , and

the dotted line represents a single bond or a double bond.

14. A compound selected from the group consisting of:

or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or a pharmaceutically acceptable salt thereof.

15. The compound according to claim 14 , wherein the compound is

or a pharmaceutically acceptable salt thereof.

16. The compound according to claim 14 , wherein the compound is

or a pharmaceutically acceptable salt thereof.

17. The compound according to claim 14 , wherein the compound is

or a pharmaceutically acceptable salt thereof.

18. A pharmaceutical composition comprising a therapeutically effective amount of the compound according to claim 1 , and one or more pharmaceutically acceptable carriers, diluents or excipients.

19. A method for inhibiting EZH2 in a patient in need thereof, comprising administering to the patient the pharmaceutical composition according to claim 18 .

20. A method for treating a tumor or cancer, comprising administering to a patient in need thereof the pharmaceutical composition according to claim 18 .

21. The method according to claim 20 , wherein the tumor and cancer are selected from the group consisting of lymphoma, leukemia, breast cancer, lung cancer, prostate cancer, ovarian cancer, liver cancer, melanoma, rhabdomyosarcoma, synovial sarcoma, mesothelioma, cervical cancer, colon cancer, rectal cancer, stomach cancer, pancreatic cancer, brain cancer, skin cancer, oral cancer, bone cancer, kidney cancer, bladder cancer, fallopian tube tumor, ovarian tumor, peritoneal tumor, glioma, glioblastoma, head and neck cancer, and myeloma.

22. The method according to claim 21 , wherein the leukemia is chronic myeloid leukemia, acute myeloid leukemia, or mixed lineage leukemia; and the lymphoma is non-Hodgkin's lymphoma, diffuse large B-cell lymphoma, or follicular lymphoma.

23. A process for preparing the compound of formula (I) according to claim 1 , comprising:

condensing a compound of formula (VI) with a compound of formula (VII) at room temperature to obtain the compound of formula (I);

wherein:

R 1 to R 5 , ring A, p, q and n are as defined in claim 1 .