Abstract: Isoliquiritigenin was synthesized with 2,4-Dihydroxyacetophenone and 4Hydroxybenzaldehyde as the starting materials by protecting of hydroxy, Aldol Addition and deprotecting. The reaction conditions of the key step-Aldol Addition, including catalyst, ratio of substrates, temperature, solvent and time were optimized. Results showed that the optimal condition of the key step were as follows: catalyst Ba(OH)₂, solvent MeOH, M(4-Hydroxybenzaldehyde):M(2,4-Dihydroxyacetophenone)=1.8∶1, tempetature 45℃, and time 12 h. Under the optimal conditions, the yield of the reaction achieved the highest(77.9%). In addition, the reaction system was simple and easily purified.

Key words: isoliquiritigenin, synthesis, optimization of conditions