Three-Component Reactions of Isochromenylium Tetrafluoroborates via Non-Classical [4+2]-Intermediates: Mild One-Step Metal-Free Synthesis of Functionalized Dihydronaphthalenes and Tetrahydronaphthalenes
作者:Zhi-Long Hu、Zhen-Yu Yang、Shaozhong Wang、Zhu-Jun Yao
DOI:10.1002/chem.201002317
日期:2011.1.24
Two novel types of elegant three‐component reactions of stable isochromenyliumtetrafluoroborates (ICTBs) have been developed under mild metal‐free conditions in this work. Mechanistically, these reactions are commonly initiated by a [4+2]‐cycloaddition between the non‐classical isochromenylium diene and the aldehyde–enol, and terminated by the following addition of weak nucleophiles, including nitriles