A series of functionalized indenes bearing 1,3-dicyano groups were synthesized from electron-rich alpha-aryl ketonitriles in the presence of K3Fe(CN)(6) and NaOAc, possibly through tandem process involving dimerization, heterolytic cleavage of carbon-carbon bond, intermolecular coupling, and the subsequent intramolecular cyclization. The 2-arylindene compounds obtained possess good fluorescent properties.
Oxidative Aromatic C−O Bond Formation: Synthesis of 3-Functionalized Benzo[<i>b</i>]furans by FeCl<sub>3</sub>-Mediated Ring Closure of α-Aryl Ketones
intramolecular cyclization of electron-rich α-aryl ketones. The alkoxy substituent on the benzene ring in the substrates was essential for an efficient cyclization to occur. This novel method allows the construction of benzo[b]furan rings by joining the O-atom on the side chain to the benzene ring via direct oxidative aromatic C−O bond formation.
通过FeCl 3介导的富电子α-芳基酮的分子内环化,获得了多种3-官能化的苯并[ b ]呋喃。底物中苯环上的烷氧基取代基对于有效环化的发生至关重要。这种新方法允许通过直接氧化芳香族C-O键形成将侧链上的O原子与苯环相连,从而构造苯并[ b ]呋喃环。