The invention relates to a preparation method for
idebenone, comprising the following steps: (1), 3,4,5-trimethoxy-
toluene has friedel-crafts reaction with 10-acetoxy-
decane chloride or 10-acetoxy-decanoyl-
bromine to generate 6-(10-acetoxy-1-oxo-
decane yl)-2,3-dimethoxy-5-methyl
phenol; (2), the 6-(10-acetoxy-1-oxo-
decane yl)-2,3-dimethoxy-5-methyl
phenol obtained in the step (1) is reacted with
hydrogen under the joint effect of
palladium-carbon catalyst and dehydrating agent DCC to generate 6-(10-acetoxy-decyl)-2,3-dimethoxy-5-methyl
phenol; (3), the6-(10-acetoxy-decyl)-2,3-dimethoxy-5-methyl phenol prepares 6-(10-hydroxy decyl) -2,3-dimethoxy-5-methyl phenol through
hydrolysis; (4), the 6-(10-hydroxy decyl) -2,3-dimethoxy-5-methyl phenol has oxidation reaction with an
oxygen-supply body under the effect of catalytic oxidizer Cu (Salen) so as to generate the
idebenone. The preparation method has low cost and high yield, which is suitable for large-scale industrial
idebenone production.