FIELD: organic chemistry and chemical technology. SUBSTANCE: products: derivatives of carbazolone of the formula (I) 
where A is group of the formula CH2R; R is -OH or 2-methyl-1H- -imidazole-1-yl; B is group 
; R1 is H, CH3,C2H5 or A and B form together group of the formula (VII) 
; R2 is CH3,C2H5 or A and B form together group of the formula (VIII) 
. Compound of the formula (I) is used as an intermediate substance for synthesis of ondansetrone that is an antiemetic agent. EFFECT: increased yield and purity degree of ondansetrone. 3 cl, 11 ex
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