FIELD: chemistry.
SUBSTANCE: method includes reacting 2,4-difluoro-5-nitro-1-chlorobenzene (2) with a compound of formula (3) 
to obtain a compound of formula (4) 
, reducing the compound of formula (4) with sodium dithionite in a suitable solvent to obtain a compound of formula (5) 
, ring closure of the compound of formula (5) to form a compound of formula (6) 
, crystallising a compound of formula (7) 
from the compound of formula (6), reacting said compound of formula (7) with an amino derivative of a compound of formula (9) 
EFFECT: high degree of purity.
10 cl, 4 dwg, 4 ex
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