Method for synthesizing dihydro maltol and ethyl maltol dihydro

One kind dihydro maltol and ethyl maltol dihydro synthetic methods of the present invention is disclosed, comprising the steps of: 2-Methyl-5,6-dihydro -2H- pyran of formula (Ⅱ) with: A carried out at a hydrogen peroxide-exchange resin acts strongly acidic ion dihydroxylation, to give formula (III) shown in 2-methyl-3,4-dihydroxy - intermediate tetrahydropyran; B: as shown in formula (III), 2-methyl-3,4-dihydroxy - tetrahydropyran intermediate oxidation under action of an oxidizing agent to give the compound of formula (IV) shown when R = ethyl, the compound of formula (IV) as shown in two ethyl maltol hydrogen, when R = methyl, the compound of formula (IV) is shown dihydro maltol. Scheme of the present invention using conventional chemical raw materials, mild reaction conditions.