Composition for enhancing immunity containing amide-based compound

A method for enhancing immunity, the method comprising administering an effective amount of a composition containing, as an active ingredient, a compound represented by the following Chemical Formula 1, a stereoisomer thereof, a pharmaceutically acceptable salt thereof, a hydrate thereof, or a solvate thereof to a subject in need thereof:

• wherein, in Chemical Formula 1,
• X is represented by any one of the following Chemical Formulae 1-1 to 1-5,
• in Chemical Formula 1-1,
• Ar is phenyl unsubstituted or substituted with one to three R1,
• R1 is hydrogen, a phenyl group, a C1-C4 alkoxy group, a C1-C4 alkyl group, a fluoro group, an adamantane group, an acetylamino group, or a hydroxyiminoethyl group,
• when there are more than one R1 residue, all R1 residues are the same as each other,
• in Chemical Formula 1-2,
• Ar is phenyl substituted with one R2,
• R2 is a C1-C4 alkyl group, a C1-C4 alkoxy group, an adamantane group, an acetyl group, or an acetylamino group,
• in Chemical Formula 1-3,
• Ar is phenyl substituted with one to three R3 or unsubstituted naphthalene,
• R3 is hydrogen, or a C1-C4 alkyl group or a phenyl group,
• when there are more than one R3 residue, all R3 residues are the same as each other,
• in Chemical Formula 1-4,
• Ar is phenyl unsubstituted or substituted with one to three R4,
• R4 is hydrogen, a phenyl group, a C1-C4 alkyl group, or a C1-C4 alkoxy group,
• when there are more than one R4 residue, all R4 residues are the same as each other,
• in Chemical Formula 1-5,
• Ar is phenyl substituted with one to three R5,
• R5 is a C1-C4 alkyl group or a phenyl group, and
• when there are more than one R5 residue, all R5 residues are the same as each other.