Acetylenic Homocoupling Methodology Towards the Synthesis of 1,3-Butadiynyl Macrocycles: [14<sub>2</sub>]-Alleno-Acetylenic Cyclophanes
作者:Inmaculada R. Lahoz、Armando Navarro-Vázquez、José Lorenzo Alonso-Gómez、M. Magdalena Cid
DOI:10.1002/ejoc.201301701
日期:2014.3
[142]-Alleno-acetylenic cyclophanes were synthesized through two different approaches: an intermolecular coupling between two alkynyl fragments, and an intramolecular ring-closure of a linear acyclic bisalkynyl oligomer. The symmetry of the target dictates the choice of the most suitable method. To illustrate these approaches we have used 1,3-diethynyl-substituted allenes as building blocks. Due to
[142]-丙炔-炔环芳烃通过两种不同的方法合成:两个炔基片段之间的分子间偶联,以及线性无环双炔基低聚物的分子内闭环。目标的对称性决定了最合适的方法的选择。为了说明这些方法,我们使用了 1,3-二乙炔基取代的丙二烯作为构建单元。由于丙二烯部分的立体特性,丙炔-炔环芳烃以非对映异构体的混合物形式获得,主要的扭曲异构体通过制备型 HPLC 进行拆分。异构体的不同对称性允许通过考虑相应 NMR 光谱中非等效基团的数量来分配主要扭曲异构体的相对构型。