FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing 2-amino-5,8-
dialkoxy[1,2,4]triazolo[1,5-c]pyrimidines of formula (I): 
, in which R is C1-C4-alkyl, comprising continuously adding an aqueous solution of hydroxylamine to a solution of [(2,5-dialkoxypyrimidin-4-yl)amino]carbonothioylcarbamate of the following formula: 
in a polar or non-polar aprotic solvent at a temperature ranging from about 60 °C to about 110 °C. Invention also relates to another version of the method of producing 2-amino-5,8-dialkoxy[1,2,4]triazolo[1,5-c]pyrimidines of formula (I).
EFFECT: disclosed is a novel method of producing 2-amino-5,8-dialkoxy[1,2,4]triazolo[1,5-c]-pyrimidines of the formula (I), which is carried out at a temperature of 60–110°C in an aprotic solvent, and formation of gaseous by-products is controlled by the continuous addition of hydroxylamine as a free base.
13 cl, 4 ex
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