FIELD: chemistry.
SUBSTANCE: invention concerns obtaining a compound of the formula I 
, where R1 is -CF3, and R2 is a hydrogen atom. The method involves introduction of a compound of the formula II 
, where R1 and R2 are the same as above, into at least one solvent, and obtained solution or suspension is cooled down and mixed with water solution of at least one base from the group of alkali metal hydroxides, such as sodium or potassium hydroxide in solid or alkali form, amides such as sodium amide, alkoholates such as sodium ethylate or potassium tert-butylate, metalorganic compounds such as n-butyllium, or a mixture of bases, in the presence of acetic anhydride, followed by extraction of the obtained coumpound of the formula I.
EFFECT: reduction of reaction length and increase in output.
6 cl, 2 tbl, 16 ex
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