A compound of the formula I: ** Formula ** or a pharmaceutically acceptable salt thereof； where: X is N or CR4； W is N or CR6； Y is No. CR7； R 1 is C 1-6 alkyl, C 1-6 haloalkyl, C 3-6 cycloalkyl, C 3-6 cycloalkyl-C 1-3 alkyl, heterocycloalkyl having 4-6 members, heterocycloalkyl having 4-6 members-C 1-3 alkyl； wherein said C1-6 alkyl, C3-6 cycloalkyl, C3-6 cycloalkyl-C1-3 alkyl, heterocycloalkyl having 4-6 members, and heterocycloalkyl having 4-6 members-C1-3 alkyl are each optionally substituted with 1, 2, or 3 substituents independently selected from fluorine, -OH, -O (C1-3 alkyl), -CN, -CF3, C1-3 alkyl, -NH2, -NH (C1-3 alkyl), - N (C1-3 alkyl) 2, -C (O) N (C1-3 alkyl) 2, -C (O) NH (C1-3 alkyl), -C (O) NH2, -C (O) O ( C1-3 alkyl), -S (O) 2 (C1-3 alkyl), - S (O) 2 (C3-6 cycloalkyl), -C (O) (C3-6 cycloalkyl), and -C (O) (C1-3 alkyl)； R2 is H or C1-3 alkyl； wherein said C1-3 alkyl is optionally substituted by 1, 2 or 3 substituents independently selected from fluoro, -OH, -O (C1-3 alkyl), -CN, -CF3, NH2, -NH (C1-3 alkyl), and -N (C1-3 alkyl) 2； or R1 and R2 together with the nitrogen atom to which they are attached forms a heterocycloalkyl having a 4-, 5-, or 6-membered ring； which is optionally substituted with 1, 2 or 3 substituents independently selected from -OH, -O (C1-3 alkyl), -CN, C1-3 alkyl, C1-3 haloalkyl, -NH2, -NH (C1-3 alkyl ), -N (C1-3 alkyl) 2, and -CH2CN； R3 is H, F, Cl, -CN, C1-3 alkyl, -OCF3, -CF3, or -O (C1-3 alkyl)； R4 is H, F, Cl, -CN, C1-3 alkyl, or -O (C1-3 alkyl)； R5 is H, F, Cl, -CN, C1-3 alkyl, or -O (C1-3 alkyl)； R6 is H, F, Cl, -CN, or C1-3 alkyl； and R7 is H, F, Cl, -CN, C1-3 alkyl, -CH2CN, -C (O) N (C1-3 alkyl) 2, -C (O) NH (C1-3 alkyl), or -C (O) NH2.Un compuesto de la fórmula I: **Fórmula** o una de sus sales farmacéuticamente aceptables； donde: X es N o CR4； W es N o CR6； Y es N o CR7； R1 es alquilo C1-6, haloalquilo C1-6, cicloalquilo C3-6, Cicloalquilo C3-6-alquilo C1-3, heterocicloalquilo que tiene 4-6 miembros, heterocicloalquilo
