Phosphine-Catalyzed [3+2] Annulation of Hepta-2,3,5-trienedioates with Alkenes for the Construction of Exocyclic Olefinic Cyclopentenes
作者:Dongqiu Li、Xiaoqian Zhang、Wendan Han、Jiao Jiao、Yuhai Tang、Silong Xu
DOI:10.1021/acs.joc.3c00550
日期:2023.7.21
employed as substrates to explore Lewis base-catalyzed annulation reactions. This leads to the discovery of a phosphine-catalyzed [3+2] annulation of 1 with electron-deficient alkenes for the construction of exocyclic olefinic cyclopentenes in good yields and moderate E:Z ratios under mild conditions. The annulation is believed to proceed in a tandem [3+2] cyclization and double bond migration in which the
Hepta-2,3,5-三烯二酸酯1已被用作底物来探索路易斯碱催化的成环反应。这导致人们发现了膦催化的1与缺电子烯烃的 [3+2] 成环反应,用于在温和条件下以良好的产率和中等的E : Z比例构建外环烯属环戊烯。据信环化以串联[3+2]环化和双键迁移的方式进行,其中ε-酯对于这两个过程都至关重要。与之前的报告相比,该反应还表现出底物控制的不同反应性。