Bifunctional Polyene Cyclizations: Synthetic Studies on Pimarane Natural Products
作者:Julian M. Feilner、Immanuel Plangger、Klaus Wurst、Thomas Magauer
DOI:10.1002/chem.202101926
日期:2021.8.25
Polyene cyclizations generate molecular complexity from a linear polyene in a single step. While methods to initiate these cyclizations have been continuously expanded and improved over the years, the majority of polyene substrates are still limited to simple alkyl-substituted alkenes. In this study, we took advantage of the unique reactivity of higher-functionalized bifunctional alkenes. The realization
多烯环化一步即可从线性多烯产生分子复杂性。尽管多年来引发这些环化的方法不断扩展和改进,但大多数多烯底物仍然仅限于简单的烷基取代的烯烃。在这项研究中,我们利用了更高官能化双官能烯烃的独特反应性。涉及跨环内终止步骤的双亲核芳基烯醇醚的多烯四环化的实现使得三环二萜pimara-15-en-3α-8α-二醇的全合成成为可能。高度灵活和模块化的路线允许制备专门用于四环去甲二萜norflickinflimiod C的全合成的多样化环化前体库。三种不同取代的丙二烯的四环化使得能够获得复杂的五环产物并提供了详细的见解进入潜在的反应途径。