FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing compounds of formula 
where R1a and R1b are selected from H and F and one of R1a and R1b is F, Het is tetrazolyl, optionally substituted with methyl, R2 is selected from benzyl and C1-C6 alkyl, optionally substituted with a halogen or C1-C4 alkyloxy. The present method includes combining compounds 
and 
where X is selected from Cl, Br, I and trifluoromethanesulphonate, Y is selected from BF3 and BR3R4, R3 and R4 are selected from OH, C1-C6monoalcohols and C1-C6diatomic alcohols, or where R3 and R4 together with B, to which they are attached, form a cyclic boronate optionally substituted with methyl.
EFFECT: obtaining oxazolidinones.
22 cl, 10 ex, 1 tbl
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