我们正在介绍我们的去环氧-tedanolide C 全合成路线的开发。通过获得的分析数据,对 tedanolide C 的拟议结构提出了质疑,并提出了这种天然产物的不同构型。合成的关键步骤是 Kiyooka 羟醛反应,该反应生成侧翼有三个含氧碳原子的叔醇,以及两个用于片段偶联的羟醛反应。 Julia-Kocienski 烯化用于侧链的安装。除了成功的合成之外,还详细描述了西南半球保护基团设置的发展以及构建目标分子的另一种逆合成尝试。
Polyoxygenated Tertiary Alcohols: A Kiyooka Approach
作者:Daniel Lücke、Markus Kalesse
DOI:10.1002/chem.201902589
日期:2019.8
the stereoselectivesynthesis of tertiary alcohols is presented. This approach allows for the incorporation of different substituents at all three remaining positions at the chiral center bearing the tertiary alcohol. To demonstrate the validity of this approach different chiral alcohols were depicted and the relationship of double bond geometry of the ketene acetal and the diastereoselectivity was
The challenging synthesis of a quaternary center within the highly oxygenated setting of tedanolide C can be performed via a Kiyooka aldol reaction. Here, the diastereomeric analog of tedanolide C with the configurations between C10 and C20 opposite compared to the proposed structure was chosen as the synthetic target. The tetra-substituted silyl ketene acetal provides the southern hemisphere of tedanolide C in useful selectivities, and the absolute configuration of the newly generated quaternary center was determined by NOE experiments of the corresponding acetonide.