FIELD: chemistry.
SUBSTANCE: described is an improved method for synthesis of 2,5,8-triazido-sim-heptazine of formula 
(I) by reacting 2,5,8-trichloro-sim-heptazine with an azidation agent in form of sodium azide in the medium of aqueous acetone at room temperature, followed by extraction of the end product via deposition from water. The invention can be used in organic synthesis.
EFFECT: high-tech and cheap method for synthesis of 2,5,8-triazido-sim-heptazine of formula (I) from commercially available 2,5,8-trichloro-sim-heptazine and a cheap azidation agent in simpler conditions for synthesis and extraction of the end product with high output and purity.
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