FIELD: chemistry.
SUBSTANCE: invention relates to a method for the production of a compound represented by the formula I, where the method includes a stage of a reaction of a compound represented by the formula II' with a compound represented by the formula IV, and a stage of a reaction of a compound represented by the formula II with corresponding acid to obtain the compound represented by the formula II'.
where R1 is CF3; Ra is selected from hydroxyl, halogen, or alkoxy; X is selected from hydrochloric acid, phosphoric acid, and maleic acid.
EFFECT: new method is developed, which is characterized by high yield, good product purity, and is more suitable for the industrial production.
7 cl, 7 ex
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