FIELD: pharmaceuticals.
SUBSTANCE: invention relates to a method of production of vadadustat (2-[[5-(3-chlorophenyl)-3-hydroxypyridine-2-carbonyl]amino]acetic acid) or its salts, as well as intermediate compounds of formula (I), where R1 represents C1-4 alkyl and R2 is C1-4 alkyl, which are used in the method.
(I)
EFFECT: method makes it possible to obtain vadadustat of high purity, essentially free of impurities.
34 cl, 5 ex
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