FIELD: chemistry.
SUBSTANCE: invention relates to the method for prepairing derivatives of 2-phenyl [1,2,4] triazolo [1,5-a] pyridine of the formula 
or its salts, wherein R1 represents hydrogen, halogen, an optionally protected hydroxy group or an optionally protected amino group and R2 represents hydrogen or halogen comprising reacting the pyridine compound of the formula 
or its salt with benzonitrile in the presence of Cu-catalyst, a 1,10-phenanthroline derivative, and the mixtures of O2/N2 characterized in that no other solvents other than benzonitrile participating in the reaction thereof, are not applicable.
EFFECT: new method for preparing a compound of the formula I, applicable on a large scale, is proposed.
13 cl, 1 tbl, 8 ex
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