aldehyde or dimethyl acetals is reported. This reaction provides a direct and rapid way for the construction of 6-substituted spiro[4.5]decanes which extensively exist in Daphniphyllum alkaloids. By the use of this method, further construction of a [5–6–7] all-carbon tricyclic core of Calyciphylline A-type alkaloids was also completed.
据报道,
路易斯酸促进了三甲基
硅烷保护的
乙烯基α-酮醇与醛或二甲基
乙缩醛的串联半
频哪醇型1,2-碳迁移/醛醇缩合反应。该反应提供了6-取代的螺的结构的直接和快速的方式[4.5]
癸烷,其在广泛存在虎皮
生物碱。通过这种方法,还完成了[5–6–7]全碳茶碱A型
生物碱三环核的构建。