Heterocycles substituted pyridine derivatives and antifungal agent containing thereof

A compound represented by the following formula (I), or a salt thereof:

• wherein R1 represents a hydrogen atom, a halogen atom, an amino group, R11—NH— (wherein R11 represents a C1-6 alkyl group, a hydroxy C1-6 alkyl group, a C1-6 alkoxy C1-6 alkyl group, or a C1-6 alkoxycarbonyl C1-6 alkyl group), R12—(CO)—NH— (wherein R12 represents a C1-6 alkyl group or a C1-6 alkoxy C1-6 alkyl group), a C1-6 alkyl group, a hydroxy C1-6 alkyl group, a cyano C1-6 alkyl group, a C1-6 alkoxy group or a C1-6 alkoxy C1-6 alkyl group;
• R2 represents a hydrogen atom, a C1-6 alkyl group, an amino group or a di C1-6 alkylamino group;
• X is an oxygen atom;
• Y is a nitrogen atom;
• ring A represents a 5- or 6-membered heteroaryl ring which may have 1 or 2 halogen atoms, or 1 or 2 C1-6 alkyl groups;
• Z represents a single bond, a methylene group, an ethylene group, an oxygen atom, a sulfur atom, —CH2O—, —OCH2—, —NH—, —CH2NH—, —NHCH2—, —CH2S—, or —SCH2—;
• R3 represents a hydrogen atom, or a halogen atom, or a C1-6 alkyl group, a C3-8 cycloalkyl group, a C6-10 aryl group, a 5- or 6-membered heteroaryl group, or 5- or 6-membered non-aromatic heterocyclic group, wherein these groups may have 1 or 2 substituents selected from substituent group α,
• wherein substituent group α represents the group consisting of a halogen atom, a cyano group, a C1-6 alkyl group, a C1-6 alkoxy group, a C1-6 alkoxycarbonyl group, a C3-8 cycloalkyl group, a C2-6 alkenyl group and a C2-6 alkynyl group;
• and
• R4 represents a hydrogen atom or a halogen atom;
• excluding compounds where all of R1, R2, and R4 represent the hydrogen atom at the same time when Z represents the single bond or R3 represents the hydrogen atom.