Synthesis of cyclobutane-fused chromanones <i>via</i> gold-mediated photocatalysis
作者:Vladislav A. Voloshkin、Marco Villa、Ekaterina A. Martynova、Marek Beliš、Kristof Van Hecke、Paola Ceroni、Steven P. Nolan
DOI:10.1039/d3sc06675d
日期:——
permits the synthesis of cyclobutane-fused chromanones from readily available starting materials. A wide range of alkenes and substituted coumarins, including naturally occurring compounds, were reacted under mild conditions leading to structurally complex products with good functional group tolerance. Mechanistic studies reveal a previously overlooked reaction pathway for energy transfer catalysis involving
能量转移(EnT)光催化已成为通过[2 + 2]-环加成反应构建复杂有机支架的有价值的工具。在此,我们提出使用 [Au(SIPr)(Cbz)] 作为香豆素和未活化烯烃的 [2 + 2]-环加成的敏化剂。广泛用于 EnT 催化的铱和有机敏化剂在所检测的催化条件下被证明效率较低。所开发的方案允许从容易获得的起始材料合成环丁烷稠合色满酮。多种烯烃和取代香豆素,包括天然存在的化合物,在温和条件下发生反应,产生具有良好官能团耐受性的结构复杂的产品。机理研究揭示了以前被忽视的涉及香豆素的能量转移催化反应途径。