Novel tricyclic compound as irak4 inhibitor

A tricyclic compound represented by the following Chemical Formula 1:

• [A1 and A2 are each independently N or CH,
• A3 is N or CR1,
• R1 is hydrogen, a halogen, —COOR5 or a (C3-C12)heteroaryl,
• R2 is hydrogen, an amino group, —COOR6, a (C1-C12)heteroaryl, a (C1-C12)heteroaryl fused to a (C3-C12)cycloalkyl, a (C6-C12)aryl, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur,
• R3 is hydrogen or a (C6-C12)aryl,
• R4 is -L1-L2-R7,
• an amino group (—NH2), a (C1-C12)heteroaryl or a (C6-C12)aryl of R2 is arbitrarily substituted with at least one or more groups selected from the group consisting of a (C1-C4)alkyl, a (C1-C4)alkyl substituted with a halogen, a (C1-C4)thioalkyl, an amino group (—NH2), a methylamino group (—NHCH3), a dimethylamino group (—N(CH3)2), —CH2OH, a (C1-C4)alkoxy, a hydroxyl group (—OH), a halogen, a methanesulfonyl group (—SO2CH3), —SO2N(CH3)2, a nitro group (—NO2), a cyano group (—CN),
• a (C6-C12)aryl of R3 is arbitrarily substituted with a nitro group (—NO2),
• L1 is —N(R8)— or —O—,
• L2 is —(CH2)m—,
• and m is an integer from 2 to 5,
• R7 is —N(R9)2, —OR10, —SO2CH3, —SO2N(CH3)2, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur,
• R5 is a (C1-C4)alkyl,
• R6 is a (C1-C4)alkyl,
• R8 is hydrogen or a (C1-C4),
• R9 is a (C1-C4)alkyl,
• R10 is a (C1-C4)alkyl,
• a heterocyclic amino of R7 is arbitrarily selected from at least one or more groups selected from the group consisting of —SO2CH3 and —COOC(CH3)3(-Boc),
• when A3 is CR1 and R1 is a halogen, —COOR5 or a (C3-C12)heteroaryl, L2 is not —(CH2)m—,
• when L2 is —(CH2)m—, R7 is neither —N(R9)2 nor —OR10, and
• when A3 is CR1, a case where both R1 and R2 are hydrogen is excluded.]