2,6-dioxo-3,6-dihydropyrimidine compound, agricultural and horticultural bactericide, nematicide, and medical and veterinary antifungal agent

A compound of formula (I) or a salt thereof:

• wherein,
• X1 represents a hydrogen atom;
• X2 represents a group represented by R1O—N═CR6;
• R1 represents a substituted or unsubstituted C1-6 alkyl group;
• R6 represents a hydrogen atom or a substituted or unsubstituted C1-6 alkyl group;
• X3 represents a substituted or unsubstituted linear C1-6 alkyl group, a substituted or unsubstituted linear C2-6 alkenyl group, a substituted or unsubstituted linear C2-6 alkynyl group, a group represented by R1—CO—, a substituted or unsubstituted C3-6 cycloalkyl group, a substituted or unsubstituted C6-10 aryl group, or a substituted or unsubstituted 4 to 6-membered ring heterocyclyl group,
• wherein
• substituent(s) on the linear C1-6 alkyl group, the linear C2-6 alkenyl group, the linear C2-6 alkynyl group, the C3-6 cycloalkyl group, the C6-10 aryl group, and the 4 to 6-membered ring heterocyclyl group are selected from the group consisting of:
• a substituted or unsubstituted C1-6 alkyl group,
• a substituted or unsubstituted C2-6 alkenyl group,
• a substituted or unsubstituted C2-6 alkynyl group,
• a hydroxy group,
• a substituted or unsubstituted C1-6 alkoxy group,
• a substituted or unsubstituted C1-6 alkylthio group,
• a substituted or unsubstituted C1-6 alkylsulfinyl group,
• a substituted or unsubstituted C1-6 alkylsulfonyl group,
• a substituted or unsubstituted C3-6 cycloalkyl group,
• a substituted or unsubstituted C6-10 aryl group,
• a substituted or unsubstituted 3 to 10-membered ring heterocyclyl group,
• a cyano group,
• a group represented by Ra—CO—,
• a group represented by Rb—O—CO—,
• a group represented by RcRdN—,
• a group represented by RcRdN—CO—,
• a group represented by Ra—CO—O—,
• a group represented by Ra—CO—NRe—,
• a group represented by Ra—CO—CO—NRe—,
• a group represented by Rb—O—CO—NRe—,
• a group represented by RcRdN—CO—O—,
• a group represented by RcRdN—CO—NRe—,
• a group represented by RcRdN—CO—CO—NRe—,
• a group represented by RcRdN—CS—NRe—,
• a group represented by RbSO2—NRe—,
• a group represented by RaO—N═CRf—, and
• a group represented by RhRiC═N—O—,
• each Ra independently represents
• a hydrogen atom,
• a substituted or unsubstituted C1-6 alkyl group,
• a substituted or unsubstituted C2-6 alkenyl group,
• a substituted or unsubstituted C2-6 alkynyl group,
• a substituted or unsubstituted C3-6 cycloalkyl group,
• a substituted or unsubstituted C6-10 aryl group, or
• a substituted or unsubstituted 3 to 10-membered ring heterocyclyl group,
• each Rb independently represents
• a substituted or unsubstituted C1-6 alkyl group, or
• a substituted or unsubstituted C3-6 cycloalkyl group,
• each Rc independently represents
• a hydrogen atom,
• a substituted or unsubstituted C1-6 alkyl group,
• a substituted or unsubstituted C3-6 cycloalkyl group, or
• a substituted or unsubstituted C6-10 aryl group,
• each Rd independently represents
• a hydrogen atom,
• a substituted or unsubstituted C1-6 alkyl group, or
• a substituted or unsubstituted C1-6 alkoxy group,
• wherein Rc and Rd can together form a divalent organic group,
• each Re independently represents
• a hydrogen atom,
• a substituted or unsubstituted C1-6 alkyl group, or
• a substituted or unsubstituted C1-6 alkoxy group,
• Rf represents
• a hydrogen atom, or
• an amino group,
• each Rh independently represents
• a substituted or unsubstituted C1-6 alkyl group, and
• each Ri independently represents a substituted or unsubstituted C1-6 alkyl group,
• wherein Rh and Ri can together form a divalent organic group;
• A represents a substituted or unsubstituted C1-6 alkylene group or a substituted or unsubstituted C2-6 alkenylene group,
• wherein
• substituent(s) on the C1-6 alkylene group and the C2-6 alkenylene group are selected from:
• a hydroxy group,
• a substituted or unsubstituted C1-6 alkoxy group,
• a substituted or unsubstituted C2-6 alkenyloxy group,
• a substituted or unsubstituted C2-6 alkynyloxy group,
• a substituted or unsubstituted C3-6 cycloalkyloxy group,
• a substituted or unsubstituted C6-10 aryloxy group,
• a substituted or unsubstituted 3 to 6-membered ring heterocyclyloxy group,
• an oxo group (O═), or
• a divalent group represented by Ra1O—N═, and
• Ra1 represents a substituted or unsubstituted C1-6 alkyl group;
• and
• Q represents a substituted or unsubstituted C6-10 aryl group or a substituted or unsubstituted 5 to 10-membered ring heterocyclyl group.