FIELD: chemistry.
SUBSTANCE: described is a method of producing compounds of formula
, in which n equals 1 or 2, R1 denotes hydrogen or halogen, R2 denotes hydrogen or halogen, and R3 denotes hydrogen, halogen or O-C1-C4alkyl, involving reaction of a compound of formula
, in which PG denotes a protective group, in an organic solvent with a compound of formula
to obtain a compound of formula
and a compound of formula 1 is obtained from this compound by splitting the protective group PG.
EFFECT: improved properties of the compound.
12 cl, 5 ex
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