Pyridone compounds and agricultural and horticultural fungicides containing the same as active ingredients

1. A compound represented by Formula (1)

or a salt thereof

wherein R1 represents

a C1-C6 alkyl group optionally substituted with one substituent A,

a C1-C6 haloalkyl group,

or RaRbN— wherein Ra and Rb each independently represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group or Ra and Rb together with the nitrogen atom to which they are bonded form an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidinyl group, a homopiperidinyl group or an azocanyl group;

R2 represents

a hydrogen atom,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent A,

a C1-C6 haloalkyl group,

a C2-C6 alkynyl group optionally substituted with one substituent A,

a C1-C6 alkoxy group optionally substituted with one substituent A,

or Rx1C(═O)— wherein Rx1 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group or RaRbN— wherein Ra and Rb are the same as defined hereinabove;

Het represents

a pyridyl group, a thienyl group, a pyrrolyl group, a pyrazolyl group, an imidazolyl group, a triazolyl group, a tetrazolyl group, an oxazolyl group or a 3 to 6-membered ring group containing 1 to 2 oxygen atoms,

the pyridyl group is optionally substituted with 0 to 4 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the thienyl group is optionally substituted with 0 to 3 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the pyrrolyl group, the pyrazolyl group, the imidazolyl group, the triazolyl group or the tetrazolyl group is each independently and optionally substituted with 0 to 4 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the oxazolyl group is optionally substituted with 0 to 2 substituents R3 with the proviso that when two substituents R3 are present, each R3 represents an independent substituent,

R3 represents

a cyano group,

a nitro group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 haloalkyl group,

a C1-C6 alkoxy group optionally substituted with one substituent C,

RaRbN— wherein Ra and Rb each independently represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group or Ra and Rb together with the nitrogen atom to which they are bonded form an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidinyl group, a homopiperidinyl group or an azocanyl group,

Rx1C(═O)— wherein Rx1 is the same as defined hereinabove,

Rx2C(═O)N(Rx3)- wherein Rx2 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group or RaRbN— wherein Ra and Rb are the same as defined hereinabove, Rx3 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group;

Y represents

a phenyl group,

the phenyl group is substituted with R4 at the ortho position and further optionally substituted with 0 to 4 substituents R5 with the proviso that when two or more substituents R5 are present, each R5 represents an independent substituent,

R4 represents

a cyano group,

a nitro group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 haloalkyl group,

or a C1-C6 alkoxy group optionally substituted with one substituent C,

R5 represents

a hydroxyl group,

a cyano group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 alkoxy group optionally substituted with one substituent C,

a C2-C6 alkenyloxy group optionally substituted with one substituent C,

a C3-C6 alkynyloxy group optionally substituted with one substituent C,

RaRbN— wherein Ra and Rb are the same as defined hereinabove,

Rc-L- wherein Rc represents a C1-C6 alkyl group or a C1-C6 haloalkyl group and L represents S, SO or SO 2 ,

or Rx1C(═O)O— wherein Rx1 is the same as defined hereinabove;

X represents an oxygen atom or a sulfur atom;

a bond containing the broken line represents a double bond or a single bond;

and the substituent A is at least one selected from the group consisting of a hydroxyl group, a cyano group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group, RaRbN— wherein Ra and Rb are the same as defined hereinabove and Rc-L- wherein Rc and L are the same as defined hereinabove;

the substituent B is at least one selected from the group consisting of a cyano group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group and a C3-C8 cycloalkoxy group;

the substituent C is at least one selected from the group consisting of a hydroxyl group, a cyano group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group, a C2-C6 alkoxyalkoxy group, RaRbN— wherein Ra and Rb are the same as defined hereinabove, Rc-L- wherein Rc and L are the same as defined hereinabove, Rx1C(═O)— wherein Rx1 is the same as defined hereinabove and a 3 to 6-membered ring group containing 1 to 2 oxygen atoms;

the substituent D is at least one selected from the group consisting of a hydroxyl group, a cyano group, a nitro group, a halogen atom, a C1-C6 alkyl group which may be substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group and a C3-C8 cycloalkoxy group.

2. A compound represented by Formula (2)

or a salt thereof

wherein R2 represents

a hydrogen atom,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent A,

a C1-C6 haloalkyl group,

a C2-C6 alkynyl group optionally substituted with one substituent A,

a C1-C6 alkoxy group optionally substituted with one substituent A,

or Rx1C(═O)— wherein Rx1 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group or RaRbN— wherein Ra and Rb each independently represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group or Ra and Rb together with the nitrogen atom to which they are bonded form an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidinyl group, a homopiperidinyl group or an azocanyl group;

Het represents

a pyridyl group, a thienyl group, a pyrrolyl group, a pyrazolyl group, an imidazolyl group, a triazolyl group, a tetrazolyl group, an oxazolyl group or a 3 to 6-membered ring group containing 1 to 2 oxygen atoms,

the pyridyl group is optionally substituted with 0 to 4 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the thienyl group is optionally substituted with 0 to 3 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the pyrrolyl group, the pyrazolyl group, the triazolyl group or the tetrazolyl group is each independently and optionally substituted with 0 to 4 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the imidazolyl group is substituted with 1 to 3 substituents R3 with the proviso that when two or more substituents R3 are present, each R3 represents an independent substituent,

the oxazolyl group is optionally substituted with 0 to 2 substituents R3 with the proviso that when two substituents R3 are present, each R3 represents an independent substituent,

R3 represents

a cyano group,

a nitro group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 haloalkyl group,

a C1-C6 alkoxy group optionally substituted with one substituent C,

RaRbN— wherein Ra and Rb each independently represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group or Ra and Rb together with the nitrogen atom to which they are bonded form an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidinyl group, a homopiperidinyl group or an azocanyl group,

Rx1C(═O)— wherein Rx1 is the same as defined hereinabove,

or Rx2C(═O)N(Rx3)- wherein Rx2 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group or RaRbN— wherein Ra and Rb are the same as defined hereinabove, Rx3 represents a hydrogen atom, a C1-C6 alkyl group optionally substituted with one substituent B, a C1-C6 haloalkyl group or a C3-C8 cycloalkyl group;

Y represents

a phenyl group,

the phenyl group is substituted with R4 at the ortho position and further optionally substituted with 0 to 4 substituents R5 with the proviso that when two or more substituents R5 are present, each R5 represents an independent substituent,

R4 represents

a cyano group,

a nitro group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 haloalkyl group,

or a C1-C6 alkoxy group optionally substituted with one substituent C,

R5 represents

a hydroxyl group,

a cyano group,

a halogen atom,

a C1-C6 alkyl group optionally substituted with one substituent C,

a C1-C6 alkoxy group optionally substituted with one substituent C,

a C2-C6 alkenyloxy group optionally substituted with one substituent C,

a C3-C6 alkynyloxy group optionally substituted with one substituent C,

RaRbN— wherein Ra and Rb are the same as defined hereinabove,

Rc-L- wherein Rc represents a C1-C6 alkyl group or a C1-C6 haloalkyl group and L represents S, SO or SO 2 ,

or Rx1C(═O)O— wherein Rx1 is the same as defined hereinabove;

X represents an oxygen atom or a sulfur atom;

and the substituent is at least one selected from the group consisting of a hydroxyl group, a cyano group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group, RaRbN— wherein Ra and Rb are the same as defined hereinabove) and Rc-L- wherein Rc and L are the same as defined hereinabove;

the substituent B is at least one selected from the group consisting of a cyano group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group and a C3-C8 cycloalkoxy group;

the substituent C is at least one selected from the group consisting of a hydroxyl group, a cyano group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C3-C8 cycloalkoxy group, a C2-C6 alkoxyalkoxy group, RaRbN— wherein Ra and Rb are the same as defined hereinabove, Rc-L- wherein Rc and L are the same as defined hereinabove), Rx1C(═O)— wherein Rx1 is the same as defined hereinabove and a 3 to 6-membered ring group containing 1 to 2 oxygen atoms; and

the substituent D is at least one selected from the group consisting of a hydroxyl group, a cyano group, a nitro group, a halogen atom, a C1-C6 alkyl group which may be substituted with one substituent B, a C1-C6 haloalkyl group, a C3-C8 cycloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group and a C3-C8 cycloalkoxy group.

3. An agricultural and horticultural pest control agent containing the compound or a salt thereof according to claim 1 as an active ingredient.

4. An agricultural and horticultural fungicide containing the compound or a salt thereof according to claim 1 as an active ingredient.

5. A method for preventing and/or treating a plant disease, which comprises applying the agricultural and horticultural pest control agent according to claim 3 to a plant, a plant seed or a soil for plant cultivation.

6. A method for preventing and/or treating a plant disease, which comprises applying the agricultural and horticultural fungicides according to claim 4 to a plant, a plant seed or a soil for plant cultivation.