Compounds of formula (I):
in which:
A represents a group of formula -CH=CH- or -CH2-CH2-;
R1 represents a halogen atom;
R2 represents a hydrogen atom, a hydroxy group, a halogen atom, an alkyl group or an alkoxy groupe;
R3 represents a hydrogen atom or a halogen atom; and
Y represents a hydroxy group, a halogen atom, an alkylamino group, a dialkylamino group, an alkenylamino group, a dialkenylamino group, an anilino group (in which the aromatic ring is unsubstituted or has one or two halogen and/or alkyl substituents), a cycloalkylamino group, a 1-pyrrolidinyl group, a piperidino group, a morpholino group, a group of formula
(in which R4 represents an alkyl group or a phenyl group) or a group of formula
(in which A, R1, R2 and R3 are as defined above) are useful agricultural fungicides having greater systemic activity and chemical stability than known compounds of similar structure. They may be applied as such or in a conventional preparation to seeds and growing plants. They may be prepared by reacting a 6-(substituted phenyl)-3(2H)-pyridazinone with formaldehyde and optionally with a halogenating agent, an appropriate amine or piperazine.
式(I)化合物:
其中
A 代表式 -CH=CH- 或 -
CH2- - 的基团;
R1 代表卤素原子
R2 代表氢原子、羟基、卤素原子、烷基或烷氧基;
R3 代表氢原子或卤素原子;以及
Y 代表羟基、卤素原子、烷基
氨基、二烷基
氨基、烯基
氨基、二烯基
氨基、
苯胺 基(其中芳环未被取代或具有一个或两个卤素和/或烷基取代基)、环烷基
氨基、 1-
吡咯烷基、
哌啶基、吗啉基、式 1 的基团、式 2 的基团、式 3 的基团、式 4 的基团、式 5 的基团、式 6 的基团、式 7 的基团、式 8 的基团、式 9 的基团、式 10 的基团、式 11 的基团、式 12 的基团、式 13 的基团。
(其中 R4 代表烷基或苯基)或式
(其中 A、R1、R2 和 R3 如上定义)是有用的农用杀菌剂,与已知的类似结构化合物相比,具有更强的系统活性和
化学稳定性。它们可以原样或以传统制剂的形式施用于种子和生长中的植物。它们可以通过 6-(取代苯基)-3(2H)-
哒嗪酮与
甲醛反应,也可选择与卤化剂、适当的胺或
哌嗪反应制备。