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Eight novel 5,7-disubstituted-2-{5-methyl-3-(4-trifluoromethylphenyl)isoxazol-4-ylcarbonylimino}-2H-1,2,4-thiadiazolo[2,3- a]pyrimidines were synthesized by multi-step reactions in yields 68-85%.Reactions were carried out either by ultrasound irradiation or conventional method,and found it was faster and more efficient under ultrasonic irradiation.Preliminary herbicidal activities against Echinochloa crus-galli,Digitaria sanguinalis and Chenopodium serotinum were also evaluated by flat-utensil method,and the results indicated that the target compounds exhibited significant activities,some were even higher than the control herbicide.
Eight novel 5,7-disubstituted-2- {5-methyl-3- (4-trifluoromethylphenyl) isoxazol-4-ylcarbonylimino} -2H-1,2,4-thiadiazolo [2,3- a] pyrimidines were synthesized by multi -step reactions in yields 68-85%. Reactions were carried either by ultrasound irradiation or conventional method, and found it was faster and more efficient under ultrasonic irradiation. Preterm herbicidal activities against Echinochloa crus-galli, Digitaria sanguinalis and Chenopodium serotinum were also evaluated by flat-utensil method, and the results indicated that the target compounds exhibited significant activities, some were even higher than the control herbicide.