Chirality Transfers through Sequential Sigmatropic Rearrangements of Allylic Vicinal Diols: Development and Application to Total Synthesis of (-)-Kainic Acid
作者:Katsunori Kitamoto、Yasuaki Nakayama、Mana Sampei、Masato Ichiki、Naoya Furuya、Takaaki Sato、Noritaka Chida
DOI:10.1002/ejoc.201200523
日期:2012.8
sigmatropic rearrangements starting from enantiopure allylic vicinal diols. Starting from the same allylic diol, the sequential Claisen/Claisen rearrangement can install two identical functional groups in a one-pot reaction, whereas, the sequential Claisen/Overman rearrangement can introduce two different functional groups, both occurring without protecting group manipulation. Both sequential reactions proceeded
详细描述了从对映体纯烯丙基邻二醇开始的两个连续 sigmatropic 重排。从相同的烯丙基二醇开始,连续克莱森 / 克莱森重排可以在一锅反应中安装两个相同的官能团,而连续克莱森 / 奥弗曼重排可以引入两个不同的官能团,两者都发生在没有保护基操作的情况下。两个连续反应都以完全立体选择性进行,这很容易通过关于烯丙二醇的两个因素的明智选择来预测:(1)羟基的立体化学和(2)烯烃的几何结构。为了证明这种顺序重排方法,我们完成了 (-)-红藻氨酸的全合成,