FIELD: heterocyclic chemistry. SUBSTANCE: product: quinone derivatives of the formula (I): A-CCR′-C(O)-R2 or their pharmaceutically acceptable salts where A a group of the formula (II), R3 and R4 and R5 are similar or different, methoxy- or ethoxy-group; 
- methyl or a group of the formula (III) where R3, R4 and R5 as indicated above; X, Y are similar or different, hydroxyl or group: -(OCH2)n-OR6 at n 0 or 1; R6 lower alkyl; R′; pentyl, benzyl, cyclohexylmethyl, phenyl or one of the groups C9H19, 
, CH2-(CH2-CH2-CH2); 2-methylenethienyl; -(CH2)2-S-CH3 group R2 at OR8 hydrogen or alkyl. Yield is 90% Reagent 1: ketone of the formula A-CH(double bond)R8 at CR′ group R2 or OR8 and R8 lower alkyl. Reagent 2: sodium hydroxide. EFFECT: improved method of synthesis. 4 tbl
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