作者:Valentina Iovine、Irene Benni、Rocchina Sabia、Ilaria D’Acquarica、Giancarlo Fabrizi、Bruno Botta、Andrea Calcaterra
DOI:10.1021/acs.jnatprod.6b00350
日期:2016.10.28
The total synthesis of the Diels–Alder-type adducts (±)-kuwanol E and the heptamethyl ether derivative of (±)-kuwanon Y has been accomplished via a convergent strategy involving 2′-hydroxychalcone 6 or 9 and dehydroprenylstilbene 7, in nine steps. The synthesis features, as a key step, a Lewis acid-mediated biomimetic intermolecular Diels–Alder [4+2] cycloaddition for the construction of the cyclohexene
的狄尔斯-阿德耳型加合物的总合成(±)-kuwanol E和七甲基醚的(±)衍生物-kuwanon Y已通过涉及2'-羟基查耳酮的会聚策略而完成的6或9和dehydroprenylstilbene 7,在九个脚步。合成的关键步骤是路易斯酸介导的仿生分子间Diels–Alder [4 + 2]环加成反应,以构建具有三个立体异构中心的环己烯骨架。值得注意的是,反应的内/外非对映选择性证明是受温度控制的。