Method for preparing pyrimidone heteroaryl derivative and intermediate of pyrimidone heteroaryl derivative

1. A method for preparing a compound of formula (I) or a stereoisomer thereof, wherein the method comprises reacting a compound of formula (III), a salt thereof or a stereoisomer thereof, with a compound of formula (II) or a salt thereof to obtain the compound of formula (I):

wherein:

G is C, D and E are N;

R 1 is selected from the group consisting of alkyl, cycloalkyl, heterocyclyl, aryl, heteroaryl and —OR 5 , wherein the alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl are each independently and optionally further substituted by one or more substituents selected from the group consisting of halogen, cyano, nitro, alkyl, haloalkyl, hydroxyalkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 5 , —C(O)OR 5 , —OC(O)R 5 , —NHS(O) m R 5 , —C(O)R 5 , —NHC(O)R 5 , —NHC(O)OR 5 , —NR 6 R 7 , —OC(O)NR 6 R 7 , —C(O)NR 6 R 7 , —NHC(O)NHR 5 and —NHC(O)NHOR 5 ;

R 2 is alkyl, wherein the alkyl is further substituted by one or more substituents selected from the group consisting of aryl and heteroaryl, wherein the aryl and heteroaryl are optionally further substituted by one or more substituents selected from the group consisting of halogen, alkyl, haloalkyl, cyano, nitro, —C(O)OR 5 , —C(O)NR 6 R 7 , —OC(O)NR 6 R 7 , —OR 5 , —NHS(O) m R 5 , —NHC(O)R 5 and —NR 6 R 7 ;

R 3 is alkyl;

R 4 is selected from the group consisting of hydrogen, cycloalkyl, heterocyclyl, aryl, heteroaryl, —OR 5 , —NR 6 R 7 and —NR 6 S(O) m R 5 , wherein the cycloalkyl, heterocyclyl, aryl and heteroaryl are optionally further substituted by one or more substituents selected from the group consisting of halogen, oxo, alkyl, haloalkyl, hydroxyalkyl, —OR 5 , —C(O)OR 5 , —OC(O)R 5 , —NR 7 S(O) m R 5 , —S(O) m R 5 , —C(O)R 5 and —NHC(O)R 5 ;

R 5 is selected from the group consisting of hydrogen, alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl, wherein the alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl are each independently and optionally further substituted by one or more substituents selected from the group consisting of alkyl, halogen, hydroxy, alkoxy, haloalkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, carboxy and alkoxycarbonyl;

R 6 and R 7 are each independently selected from the group consisting of hydrogen, alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl, wherein the alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl are each independently and optionally further substituted by one or more substituents selected from the group consisting of alkyl, halogen, hydroxy, alkoxy, haloalkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, carboxy and alkoxycarbonyl;

or, R 6 and R 7 together with the nitrogen atom to which they are attached form a heterocyclyl, wherein the heterocyclyl contains one or more heteroatoms selected from the group consisting of N, O and S(O) m , and the heterocyclyl is optionally further substituted by one or more substituents selected from the group consisting of alkyl, halogen, hydroxy, alkoxy, haloalkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, carboxy and alkoxycarbonyl;

R a is alkyl, wherein the alkyl is optionally further substituted by one or more substituents selected from the group consisting of alkyl, halogen, hydroxy, alkoxy, cycloalkyl, heterocyclyl, aryl, heteroaryl, carboxy and alkoxycarbonyl;

m is 0, 1 or 2; and

n is 1, 2, 3 or 4.

2. The method according to claim 1 , wherein the compound of formula (III), a salt thereof or a stereoisomer thereof, is prepared by the following method:

wherein:

X is halogen;

the compound of formula (VI) is a mono-metal alkoxide or a bi-metal alkoxide; and

M is selected from the group consisting of a monovalent metal cation, a divalent metal cation, a trivalent metal cation and a tetravalent metal cation.

3. The method of claim 2 , wherein the compound of formula (VI) is prepared by the following method:

wherein:

R b is alkyl.

4. The method according to claim 1 , wherein the compound of formula (I) is a compound of formula (I-1) or a stereoisomer thereof, the compound of formula (II) is a compound of formula (II-1) or a salt thereof, and the compound of formula (III) is a compound of formula (III-1), a salt thereof or a stereoisomer thereof, wherein the method is as follows:

5. The method according to claim 4 , wherein the compound of formula (III-1) is prepared by the following method:

wherein the compound of formula (VI-1) is a mono-metal alkoxide or a bi-metal alkoxide; and

M is selected from the group consisting of a monovalent metal cation, a divalent metal cation, a trivalent metal cation and a tetravalent metal cation.

6. The method according to claim 5 , wherein the compound of formula (VI-1) is prepared by the following method:

wherein no acid is added in the post-treatment step of the method for preparing the compound of formula (VI-1) from the compound of formula (VII-1), and the acid is selected from the group consisting of an organic acid and an inorganic acid.

7. A method for preparing a compound of formula (I-1), wherein the method comprises

wherein no acid is added in the post-treatment step of preparing the compound of formula (VI-1-1) from the compound of formula (VII-1), and the acid is selected from the group consisting of an organic acid and an inorganic acid.