Synthetic method of racemic dihydroquercetin

The invention is applicable to the technical field of organic synthesis, and provides a synthetic method of racemic dihydroquercetin, which comprises the following steps: preparing 2, 4, 6-(trimethoxymethoxy) acetophenone; the preparation method comprises the following steps: preparing 3, 4-(dimethoxymethoxy) benzaldehyde; the preparation method comprises the following steps: preparing 1-(2, 4, 6-tri (methoxymethoxy)) phenyl)-3-(3, 4-di (methoxymethoxy)) phenyl oxirane-2-yl) ketone from 2-(2, 4, 6-tri (methoxymethoxy) phenyl)-3-(3, 4-di (methoxymethoxy) phenyl oxirane-2-yl) ketone; and the racemic dihydroquercetin is prepared. The aldol condensation step and the epoxidation step are creatively combined, the existing dihydroquercetin synthesis step is reduced by one step and compressed into four steps, the reaction operation cost is greatly reduced, meanwhile, the post-treatment process is creatively optimized, and the yield of dihydroquercetin is increased. Therefore, separation and purification in each step