Exploratory Studies Aimed at a Synthesis of Vinigrol. 2. Attempts to Exploit Ring-Closing Metathesis for Construction of the Central Cyclooctane Belt
作者:Leo A. Paquette、Ivan Efremov、Zuosheng Liu
DOI:10.1021/jo048458x
日期:2005.1.1
functionalized intermediates, such that the olefinic termini of the side chains could enter into intramolecular carbon−carbon bond formation. In no example was ring closure observed to operate. Instead, the strategically placed π-bonds were seen to migrate internally to the chain in select examples. Although the pivotal transformations failed, the deployment of a number of useful stereocontrolled reactions
描述了一种程序,该程序旨在使闭环易位适应于长春总酚的总合成。利用从先前研究中获得的通用类型3中间体的便捷途径,制备了几种候选底物。这些包括环氧二烯10和22,二乙酰氧基三烯42和高度官能化的环己烷48。这种方法的中心问题是向这些官能化的中间体传达最大程度的构象柔性,以使侧链的烯烃末端可以进入分子内碳-碳键的形成。在任何例子中都没有观察到闭环起作用。取而代之的是,在选定的示例中,看到了具有战略意义的π键在内部向链迁移。尽管关键的转化失败了,但许多有用的立体控制反应的部署最终导致了重取代的顺式十氢化萘的制备。