FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing a compound of formula 
which includes treating a diamine of formula
in an aprotic solvent with an oxadiazole of formula 
, which, in the presence of a water-binding agent in a mixture with a tertiary amine, at temperature of 10-100°C and pressure of 1-6 bar, is converted to a compound of formula 
which, without separation, is then converted by hydrogenation and addition of para-toluene sulphonic acid and ammonia to an amidine of formula 1.
EFFECT: method enables to conduct synthesis without separating the intermediate product and replacing the solvent, avoids use of hot filtration and increases output of the product.
3 cl, 6 ex
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