Coumarin oxime ester compounds, preparation and use thereof

A coumarin (keto) oxime ester compound of formula (I):

• wherein:
• n is 0;
• R1, R3, and R4, independently represent hydrogen, halogen, nitro, hydroxyl, mercapto, carboxyl, C1-C8 carboxylate ester group, sulfonic acid group, amino, cyano, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C4-C20 cycloalkylalkyl, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, C3-C20 cycloalkoxy, C4-C20 cycloalkylalkoxy, C1-C20 alkylthio, C2-C20 alkenylthio, C2-C20 alkynylthio, C3-C20 cycloalkylthio, C4-C20 cycloalkylalkylthio, C6-C18 aryl, C6-C18 aryloxy and C6-C18 arylthio, wherein the aforementioned amino, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C4-C20 cycloalkylalkyl, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, C3-C20 cycloalkoxy, C4-C20 cycloalkylalkoxy, C1-C20 alkylthio, C2-C20 alkenylthio, C2-C20 alkynylthio, C3-C20 cycloalkylthio, C4-C20 cycloalkylalkylthio, C6-C18 aryl, C6-C18 aryloxy and C6-C18 arylthio may be optionally substituted with one or more groups independently selected from the group consisting of:
• halogen, nitro, hydroxy, mercapto, carboxyl, sulfonic acid group, amino, cyano, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkylthio, C2-C6 alkenyl and C2-C6 alkynyl,
• R2 represents halogen, nitro, hydroxyl, mercapto, carboxyl, C1-C8 carboxylate ester group, sulfonic acid group, amino, cyano, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C4-C20 cycloalkylalkyl, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, C3-C20 cycloalkoxy, C4-C20 cycloalkylalkoxy, C1-C20 alkylthio, C2-C20 alkenylthio, C2-C20 alkynylthio, C3-C20 cycloalkylthio, C4-C20 cycloalkylalkylthio, C6-C18 aryl, C6-C18 aryloxy and C6-C18 arylthio, wherein the aforementioned amino, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C4-C20 cycloalkylalkyl, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, C3-C20 cycloalkoxy, C4-C20 cycloalkylalkoxy, C1-C20 alkylthio, C2-C20 alkenylthio, C2-C20 alkynylthio, C3-C20 cycloalkylthio, C4-C20 cycloalkylalkylthio, C6-C18 aryl, C6-C18 aryloxy and C6-C18 arylthio may be optionally substituted with one or more groups independently selected from the group consisting of:
• halogen, nitro, hydroxy, mercapto, carboxyl, sulfonic acid group, amino, cyano, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkylthio, C2-C6 alkenyl and C2-C6 alkynyl;
• and
• R5 is H,
• R6, and R7 independently represent linear or branched C1-C20 alkyl, C3-C10 cycloalkyl, C4-C10 cycloalkylalkyl, C4-C10 alkylcycloalkyl, C6-C20 aryl, C7-C20 aralkyl and C7-C20 alkylaryl, wherein the aforementioned C1-C20 alkyl, C3-C10 cycloalkyl, C4-C10 cycloalkylalkyl, C4-C10 alkylcycloalkyl, C6-C20 aryl, C7-C20 aralkyl and C7-C20 alkylaryl are optionally substituted with one or more groups independently selected from the group consisting of:
• C1-C6 alkyl, C1-C6 alkylthio, C1-C6 alkoxy, halogen, nitro, amino, mono(C1-C6 alkyl)amino, di(C1-C6 alkyl)amino and mercapto,
• except for the compound that meets the following definitions:
• n is 0, R1, R2, R3, R4 and R5 are all H, R6 is methyl, and R7 is n-propyl.