Pyrimidin-2-oxy-4-one and pyrimidin-2-oxy-4-thione derivatives, and a method of controlling or preventing infestation of cultivated plants by phytopathogenic microorganisms using them

摘要

Novel pyrimidin-4-one and pyrimidin-4-thione derivatives of formula (I) wherein A is phenyl, thienyl (including all 3 isomers), thiazolyl or pyridyl; X is oxygen or sulfur; R1 is hydrogen, halogen or trimethylsilyl; R2 is hydrogen, halogen or trimethysilyl; and at least one of R1 and R2 is not hydrogen; R3 is C1-C6alkyl, C1-C6haloalkyl, C2-C6alkenyl, C2-C6haloalkenyl, C2-C6alkynyl, C2-C6haloalkynyl, -(CH2)n-C3-C8cycloalkyl which are unsubstitituted or substituted by halogen, C1-C6alkyl or C1-C6haloalkyl, C1-C4alkoxy-C1-C6alkyl; C1-C4alkoxy-C2-C6alkenyl; C1-C4alkoxy-C2-C6alkenyl; C1-C4alkythio-C1-C6alkyl; C1-C4alkylthio-C2-C6alkenyl; C1-C4alkythio-C2-C6alkynyl; mono-C1-C4alkylamin-C1-C6alkyl; mono-C1-C4alkylamin-C1-C6alkenyl; mono-C1-C4alkylamin-C2-C6alkynyl; -(CH2)n-C1-C4alkoxy-C3-C6cycloalkyl; -(CH2)n-C1-CHI