Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 50, Issue 17, Pages 4839-4845Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf0202436
Keywords
rice; blast; Magnaporthe grisea; antifungals; pyrazolo[3,4-d][1,3]thiazine; pyrazolo[1,5-c]-[1,3,5]thiadlazine; pyrazolo[3,4-d]pyrimidine
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Some pyrazolo[3,4-d]pyrimidin-4(5H)-thione, pyrazolo[3,.4-d][1,3]thiazin-4-one/thione, and pyrazolo[1,5-c][1,3,5]thiadiazine-4-one/thione derivatives were synthesized and screened for antifungal activity,against the causal agent of rice blast disease, Magnaporthe grisea. In all cases a remarkable inhibition of fungal growth was found in the range from 10 to 200 mug mL(-1). Several compounds were able to control mycelium growth at a rate of 10 mug mL(-1), a concentration at which the reference compound tricyclazole was completely ineffective. At least in the case of the most active substance, at the same dose the growth of seedlings or cultured cells of rice was substantially unaffected. Results allowed definition of structural requirements either to maintain or to enhance mycotoxic activity.
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