An improved eight-membered ring closure by means of a Lewis-acid-catalyzed ene reaction was applied to the synthesis of cycloaraneosene and its congener, “hydroxycycloaraneosene.” Comparisons of the NMR spectral data of the synthetic and natural compounds established that the natural product possesses an 8β-hydroxy structure, not the originally proposed 9α-hydroxy one.
通过
路易斯酸催化的烯反应改进的八元环闭合应用于环
芳烃烯及其同系物“羟基环
芳烃烯”的合成。合成和天然化合物的 NMR 光谱数据的比较确定
天然产物具有 8β-羟基结构,而不是最初提出的 9α-羟基结构。