FIELD: chemistry.
SUBSTANCE: invention relates to the field of organic chemistry, namely to methods of obtaining intermediate compounds of formulae 
, 
and 
for obtaining compounds of formula 
, where R1 stands for -C1-6alkyl; R2 stands for -O-C1-5alkyl, R3 stands for -C1-6alkyl. The invention also relates to crystalline forms of the intermediate compounds of formulae (II) and (III).
EFFECT: methods of obtaining novel intermediate compounds, useful in the synthesis of compound (IV), required for the synthesis of biologically active compounds.
27 cl, 4 dwg, 5 ex
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