Pd-Catalyzed Formal [3 + 3] Heteroannulation of Allylic <i>gem</i>-Diacetates: Synthesis of Chromene-Based Natural Products and Exploration of Photochromic Properties
作者:Prashant Kumar、Pravesh Kumar、Sugumar Venkataramani、S. S. V. Ramasastry
DOI:10.1021/acscatal.1c05450
日期:2022.1.21
meta-substituted phenols) to produce novel polycyclic chromenes possessing spiro-, tri-, and tetrasubstituted carbon centers. The versatility of the method is demonstrated in the synthesis of several chromene-based bioactive natural products. Further, interesting photochromic properties of the new classes of benzo[f]chromenes are also discovered.
很少探索钯催化的烯丙基偕二乙酸酯的烯丙基烷基化反应。这项工作揭示了烯丙基宝石-二乙酸酯的一种不寻常的化学反应模式,并将它们确立为合成复杂苯并[ f ]色烯系统的新原型。在反应条件下,二乙酸酯表现为 1,3-双阳离子等价物,并与 2-萘酚(和间位取代的酚)发生 [3 + 3] 杂环化反应,生成具有螺、三和四取代碳的新型多环色烯中心。该方法的多功能性在几种基于色烯的生物活性天然产物的合成中得到证明。此外,新类别苯并[ f]铬烯也被发现。