Pyridine ring-substituted pyridazinol compounds and derivatives, preparation methods, herbicidal compositions and applications thereof

A pyridine ring-substituted pyridazinol compound of Formula I or a derivative thereof:

• wherein, X is halogen, cyano, alkyl, halogenated alkyl, alkoxy, halogenated alkoxy, R1R2N—(C═O)—, R1R2N—, hydroxy, or unsubstituted or substituted aryl;
• Y is independently selected from hydrogen, halogen, cyano, nitro, azido, a halogen-containing or not containing group selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and cycloalkylalkyl, a group selected from aryl, arylalkyl, heteroaryl, and heteroarylalkyl, which is unsubstituted or substituted, R—O—(CH2)n—, R—O—(CH2)p—O—(CH2)q—, R—O—(CH2)p—S—(CH2)q—, R—S—(CH2)n—, R—S—(CH2)p—O—(CH2)q—, R—S—(CH2)p—S—(CH2)q—, R—O—(CH2)—(C═O)—(CH2)q—(O)m—, R—S—(CH2)n—(C═S)—(CH2)q—(S)m—, R—O—(CH2)n—(C═O)—(CH2)q—(S)m—, R—O—(CH2)n—(C═S)—(CH2)q—(O)m—, R—S—(CH2)n—(C═O)—(CH2)q—(O)m—, R—O—(CH2)n—(C═S)—(CH2)q—(S)m—, R—S—(CH2)n—(C═O)—(CH2)q—(S)m—, R—S—(CH2)n—(C═S)—(CH2)q—(O)m—, R—(C═O)—(CH2)n—, R—(C═S)—(CH2)n—, R—(C═O)—(CH2)n—O(CH2)q—, R—(C═S)—(CH2)n—S—(CH2)q—, R—(C═O)—(CH2)n—S—(CH2)q—, R—(C═S)—(CH2)n—O—(CH2)q—, R—SO—(CH2)n—(O)m—, R—SO—(CH2)n—(S)m—, R—SO—(CH2)—(NR3)m—, R—SO2—(CH2)n—(O)m—, R—SO2—(CH2)n—(S)m—, R—SO2—(CH2)n—(NR3)m—, R1R2N—(CH2)n—, R1R2N—(CH2)n—O—(CH2)q—(O)m—, R1R2N—(CH2)n—O—(CH2)q—(S)m—, R1R2N—(CH2)n—O—(CH2)q—(NR3)m—, R1R2N—(CH2)n—(C═O)—(CH2)q—(O)m—, R1R2N—(CH2)n—(C═O)—(CH2)q—(S)m—, R1R2N—(CH2)n—(C═O)—(CH2)q—(NR3)m—, R1R2N—(CH2)n—SO2—(CH2)q—(O)m—, R1R2N—(CH2)n—SO2—(CH2)q—(S)m—, R1R2N—(CH2)n—SO2—(CH2)q—(NR3)m—, R1R2PO3—(O)m—(CH2)q—, R1R2R3SiO—(CH2)q—, R1R2R3Si—(CH═CH)m—(CH2)q—, R1R2C═N—(O)m—(CH2)n—, and R1R2C═N—NH—(CH2)n—;
• or two adjacent Y form —OCH2O—, —CH2CH2O—, —OCH2CH2O—, —OCH(CH3)O—, —OC(CH3)2O—, —OCF2O—, —CF2CF2O—, —OCF2CF2O—, or —CH═CH—CH═CH—;
• r is an integer from 0 to 4, m is 0 or 1, n and q are independently an integer from 0 to 8, p is an integer from 1 to 8;
• R is hydrogen, a halogen-containing or not containing group selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and cycloalkylalkyl, or a group selected from aryl, arylalkyl, heteroaryl, and heteroarylalkyl, which is unsubstituted or substituted;
• R1, R2, R3 are each independently hydrogen, nitro, hydroxy, amino, a halogen-containing or not containing group selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkylalkyl, alkoxy, alkenyloxy, alkynyloxy, cycloalkyloxy, alkoxyalkyl, alkoxycarbonyl, alkylsulfanylcarbonyl, alkylsulfonyl, alkylsulfonylalkyl, alkylcarbonyl, alkylcarbonylalkyl, alkylcarbonyloxy, alkylamino, alkylaminocarbonyl, alkoxyaminocarbonyl, alkoxycarbonylalkyl, alkylaminocarbonylalkyl, trialkylsilyl, and dialkylphosphonyl, or a group selected from aryl, arylalkyl, aryloxy, arylalkyloxy, aryloxyalkyl, arylcarbonyl, arylsulfonyl, heteroaryl, heteroarylalkyl, heteroaryloxy, heteroarylalkyloxy, heteroaryloxyalkyl, heteroarylcarbonyl, and heteroarylsulfonyl, which is unsubstituted or substituted;
• or R1R2N— forms a 6-membered heterocyclyl, which is unsubstituted or substituted.