A synthetic approach to pordamacrine A that features two key transformations is discussed. The first transformation applies an Ireland-Claisen rearrangement to establish sterically congested vicinal carbon centers. Although a hard enolization technique for accessing the silyl ketene acetal failed, a soft enolization, boron-based reaction was highly successful. The second step involves a proposed cascade
讨论了以两个关键转变为特征的波达马克林A的合成方法。第一个转换应用了爱尔兰-克莱森重排技术,建立了拥挤的邻近碳中心。尽管用于进入甲
硅烷基烯酮
缩醛的硬烯醇化技术失败,但是基于
硼的软烯醇化反应非常成功。第二步涉及拟议的级联
钯催化双环化反应,以构建两个
天然产物的碳环。提出了总体策略,展示了在这种复杂环境下环化事件的挑战。