Abstract
Abstract Eight novel 5,7-disubstituted-2-{5-methyl-3-(4-trifluoromethylphenyl)isoxazol-4-ylcarbonylimino}-2 H -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.
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