Tandem Claisen Rearrangement/6-<i>endo</i>Cyclization Approach to Allylated and Prenylated Chromones
作者:Bernd Schmidt、Martin Riemer、Uwe Schilde
DOI:10.1002/ejoc.201501151
日期:2015.12
o-acylphenols reacted upon microwave irradiation to form C-allylated or -prenylated chromone derivatives, depending on the substitution pattern of the arene and the allyl substituent. The reaction proceeds through a tandem Claisen rearrangement and 6-endo-trig or 6-endo-dig cyclization sequence. For prenyl ethers, the tandem sequence can be extended by a Cope rearrangement to furnish 6-prenylchromones.
源自邻酰基苯酚的烯丙基、二甲基烯丙基和异戊二烯醚在微波辐射下反应形成 C-烯丙基化或异戊二烯化色酮衍生物,具体取决于芳烃和烯丙基取代基的取代模式。该反应通过串联克莱森重排和 6-endo-trig 或 6-endo-dig 环化序列进行。对于异戊二烯醚,串联序列可以通过 Cope 重排扩展以提供 6-异戊二烯色酮。该方法可用于合成天然产物和药物。