FIELD: organic chemistry.
SUBSTANCE: invention relates to a method of producing a compound of formula (I), comprising a step of reacting a compound of formula VII with a base, which is lithium bis(trimethylsilyl)amide, in the presence of a lithium halide, where LG denotes a leaving group, wherein the method is carried out in an aprotic inert solvent at temperature of −100 °C to 0 °C.
EFFECT: method of producing a compound of formula (I), characterized by high output and purity of the desired compound.
9 cl, 1 tbl, 2 ex
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