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Analysis Research Division, Daegu Center, Korea Basic Science Institute, Daegu 702-701, KoreaReceived May 1, 2012, Accepted May 14, 2012The total synthesis of biologically interesting β-hydroxypyranochalcones, purpurenone (1), its derivative 2,praecansone B (3), and pongapinone A (4) has been accomplished starting from commercially available 2,4-dihydroxyacetophenone or 6-methoxy-2,4-dihydroxyacetophenone in 3 steps by a convergent strategy throughbenzopyran formations, O-methylations, and coupling reactions. Key Words : β-Hydroxypyranochalcone, Purpurenone, Praecansone B, Pongapinone A, Benzopyran forma-tionIntroductionPyranochalcones and β-hydroxypyranochalcones are ab-undant subclasses of flavonoid and are widely distributed innature.

Concise Synthetic Approaches to Naturally Occurring β-Hydroxypyranochalcones: First Total Synthesis of Purpurenone, Its Derivative, and Praecansone B