Azaheteroaryl compound, preparation method therefor, and application thereof

A compound represented by formula (I), a pharmaceutically acceptable salt thereof, a stereoisomer thereof, a solvate thereof or their isotope-labeled derivative:

• wherein
• A is
• X is N or CR7;
• R1 is H, halogen, C1-4 alkoxy, unsubstituted C1-6 alkyl or C1-6 alkyl substituted by R3, an unsubstituted amino group or an amino group substituted by R4, unsubstituted C1-4 haloalkyl or C1-4 haloalkyl substituted by R3, unsubstituted C3-6 cycloalkyl or C3-6 cycloalkyl substituted by hydroxyl, or unsubstituted C3-6 heterocycloalkyl or C3-6 heterocycloalkyl substituted by R5;
• R2 is H, C1-4 alkyl, C3-6 cycloalkyl or an unsubstituted amino group or an amino group substituted by C1-4 alkyl;
• R3 is independently hydroxyl, carbonyl, —CN, halogen, C3-6 heteroaryl, unsubstituted C1-4 alkoxy or C1-4 alkoxy substituted by hydroxyl, an unsubstituted amino group or an amino group substituted by R6, C1-4 alkyl, C1-4 haloalkyl, C3-6 cycloalkyl or unsubstituted C3-6 heterocycloalkyl or C3-6 heterocycloalkyl substituted by C1-4 alkyl;
• R4 is independently carbonyl, C1-4 alkyl, C1-4 haloalkyl, C3-6 cycloalkyl or C3-6 heterocycloalkyl;
• R5 is independently C1-4 alkyl or C3-6 heterocycloalkyl;
• R6 is independently unsubstituted C1-4 alkyl or C1-4 alkyl substituted by R6-1;
• R6-1 is independently hydroxyl or an unsubstituted amino group or an amino group substituted by C1-4 alkyl;
• R7 is independently H, hydroxyl, —CN, halogen, C1-4 alkoxy or C1-4 alkyl;
• the number of R3 is 1, 2, 3 or 4;
• the number of R4 is 1 or 2;
• the number of R5 is 1, 2, 3 or 4;
• the number of R6 is 1 or 2;
• the heteroatom in the C3-6 heterocycloalkyl and C3-6 heteroaryl is selected from N, O and S, and the number of the heteroatom is 1, 2, 3 or 4;
• the compound represented by formula (I) is not