The First Synthesis of Uralenol, 5′-Prenylated Quercetin, via Palladium-Catalyzed O-Dimethylallylation Reaction with Concurrent Acetyl Migration
作者:Hisao Nemoto、Tomoyuki Kawamura、Moemi Hayashi、Rie Mukai、Junji Terao
DOI:10.1055/s-0033-1338559
日期:——
excellent yield. 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
摘要 描述了尿烯醇的首次合成,即5'-异戊烯基槲皮素。关键步骤是钯催化的O-1,1-二甲基烯丙基化反应,同时进行乙酰基迁移,从而得到所需的中间体(主要异构体),并通过重结晶进行纯化。最后,克莱森重排,然后将所有酚保护基脱保护,以优异的产率得到了乌拉烯醇。 描述了尿烯醇的首次合成,即5'-异戊烯基槲皮素。关键步骤是钯催化的O-1,1-二甲基烯丙基化反应,同时进行乙酰基迁移,从而得到所需的中间体(主要异构体),并通过重结晶进行纯化。最后,克莱森重排,然后将所有酚保护基脱保护,以优异的产率得到了乌拉烯醇。