FIELD: organic chemistry and technology. SUBSTANCE: protected cyclobutanone of the formula (I) 
is treated with dialkylaluminium chloride or alkylaluminium dichloride, trialkylaluminium compounds in medium of aprotonic solvent at temperature from minus 90 C to the solvent boiling point. The end compound is used for synthesis as an intermediate compound for synthesis of antiviral preparations. EFFECT: improved method of synthesis. 4 cl, 7 ex
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