Abstract
The first synthesis of uralenol, 5′-prenylated quercetin, is described. The key step is a palladium-catalyzed O-1,1-dimethylallylation reaction, with concurrent acetyl migration to afford the desired intermediate as a major isomer, which was purified by recrystallization. Finally, Claisen rearrangement, followed by deprotection of all phenolic protecting groups, afforded uralenol in excellent yield.
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