BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a pyridinium salt and a pest control agent. More specifically, the present invention relates to a pyridinium salt which has excellent insecticidal activity and/or acaricidal activity, is excellent in safety and can be synthesized in an industrially favorable manner, and a pest control agent containing this pyridinium salt as an active ingredient.

The present application is the U.S. National Stage of PCT/JP2018/043554, filed Nov. 27, 2018, which claims priority on Japanese Patent Application No. 2017-231998, filed in Japan on Dec. 1, 2017, the content of which is incorporated herein by reference.

Description of the Related Art

Various compounds having insecticidal/acaricidal activities have been proposed. In order to put such a compound to practical use as an agricultural chemical, it is required not only to have sufficiently high efficacy, but also to be difficult to cause drug resistance, not to cause phytotoxicity to plants or soil pollution, and to have low toxicity to livestock and fish, or the like.

Incidentally, Patent Document 1 discloses a compound represented by formula (A) having acaricidal activity, and the like.



Further, Non-Patent Document 1 discloses a compound represented by formula (B) having analgesic activity, and the like.



PRIOR ART DOCUMENTS

Patent Document

[Patent Document 1] U.S. Pat. No. 4,138,548

Non-Patent Document

[Non-Patent Document 1] Journal of Medicinal Chemistry, 1982, vol. 25, p 720-723

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

An object of the present invention is to provide a pyridinium salt which is excellent in pest control activity, in particular, insecticidal activity and/or acaricidal activity, excellent in safety and can be synthesized in an industrially favorable manner. Another object of the present invention is to provide a pest control agent, an insecticidal or acaricidal agent, an ectoparasite control agent, or an endoparasite control- or exterminating agent containing a pyridinium salt as an active ingredient.

Means for Solving the Problem

As a result of intensive studies in order to solve the above problems, the present invention including the following embodiments has been completed.

[1] A compound represented by formula (I) or formula (II):



wherein,

A represents an oxygen atom or a sulfur atom;

X1represents a halogeno group, a substituted or unsubstituted C1-6alkyl group, a substituted or unsubstituted C2-6alkenyl group, a substituted or unsubstituted C2-6alkynyl group, a hydroxyl group, a substituted or unsubstituted C1-6alkoxy group, a substituted or unsubstituted C2-6alkenyloxy group, a substituted or unsubstituted C2-6alkynyloxy group, a substituted or unsubstituted C1-6alkylcarbonyl group, a substituted or unsubstituted C1-6alkoxycarbonyl group, a substituted or unsubstituted C1-6alkylthio group, a substituted or unsubstituted C1-6alkylsulfinyl group, a substituted or unsubstituted C1-6alkylsulfonyl group, a substituted or unsubstituted C1-6alkylsulfonyloxy group, an amino group, a substituted or unsubstituted C1-6alkylamino group, a substituted or unsubstituted C3-8cycloalkyl group, a substituted or unsubstituted C3-8cycloalkyloxy group, a substituted or unsubstituted C6-10aryl group, a substituted or unsubstituted C6-10aryloxy group, a substituted or unsubstituted 5- to 6-membered heteroaryl group, a substituted or unsubstituted 5- to 6-membered heteroaryloxy group, a pentafluorosulfanyl group, a nitro group or a cyano group;

m represents the number of X1and is any integer of 0 to 5;

any two of X1may be bound together to form a bivalent hydrocarbon group;

Y represents a single bond or a substituted or unsubstituted C2-6alkenylene group;

Q1represents a substituted or unsubstituted C6-10arylene group or a substituted or unsubstituted 6- to 10-membered heteroarylene group;

Q2represents a substituted or unsubstituted C6-10aryl group or a substituted or unsubstituted 5- to 6-membered heteroaryl group;

Zq−represents a counter ion; and q represents a valence of the counter ion and is 1 or 2.

[2] A pest control agent containing at least one compound selected from the compounds according to the above [1] as an active ingredient.

[3] An insecticidal or acaricidal agent containing at least one compound selected from the compounds according to the above [1] as an active ingredient.

[4] An ectoparasite control agent containing at least one compound selected from the compounds according to the above [1] as an active ingredient.

[5] An endoparasite control agent or exterminating agent containing at least one compound selected from the compounds according to the above [1] as an active ingredient.

Effects of the Invention

The pyridinium salt of the present invention has a function of controlling pests which are problematic in terms of agricultural crops and hygiene. A control agent containing the pyridinium salt of the present invention can effectively control pests, particularly agricultural pests and mites and ticks at a lower concentration, and can also effectively control ectoparasites and endoparasites that may harm humans and animals.

