FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention describes a method for preparing 5-amino-3-sulfonylamino-1,2,4-triazoles of the formula (I): 
wherein R represents phenyl, para-methoxyphenyl, 2-naphthyl, para-para-toluene or para-chlorophenyl radical that can be used in manufacturing herbicides and antibacterial preparations. Method for preparing compounds of the formula (I) involves mixing 1-acetyl-3,5-diamino-1,2,4-triazole (II), pyridine and sulfonyl chloride of the formula (III): 
taken in the mole ratio = (II) : (III) = 1:((0.9-1.1), and prepared mixture is heated at stirring and temperature 80-120°C followed by dilution with water, and precipitated deposit is dissolved in alkaline metal hydroxide solution at heating at temperature 90-100°C and neutralized to pH value 6-8. Method provides reducing the cost of compounds of the formula (I) based on using the less expensive raw, decreasing duration of the process and enhancing its safety.
EFFECT: improved preparing method.
2 cl, 5 ex
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