Scheme 2From: Design and synthesis of chalcone derivatives as potential non-purine xanthine oxidase inhibitorsSynthesis of sappanchalcone (7). Reagent and conditions: a CH3COOH, polyphosphoric acid, 60 °C, 30 min; b 2ʹ,4ʹ-dihydroxyacetophenone, KOH 12 M, ultrasound-assisted, 80 °C, 8 hBack to article page