An efficient and room-temperature procedure is developed for high yield synthesis of novel α,β-unsaturated derivatives of thiopyran 3 directly from ketone 1 and various aldehydes in the presence of catalytic quantities of TMSNMe2 and MgBr2˙OEt2 under solvent-free conditions. The main advantage of the procedure is that the formation of the undesired bis by-products is minimized. In addition, the procedure
Fe<sub>3</sub>O<sub>4</sub> Nanoparticles as an Efficient and Magnetically Recoverable Catalyst for the Synthesis of <font>α</font>,<font>β</font>-Unsaturated Heterocyclic and Cyclic Ketones under Solvent-Free Conditions
作者:Tooba Alishiri、Hossein A. Oskooei、Majid M. Heravi
DOI:10.1080/00397911.2013.786089
日期:2013.12.17
Abstract An efficient and green procedure has been developed for the synthesis of monoarylidenes of cyclic and heterocyclic ketones. The reaction was carried out under solvent-free conditions in the presence of a catalytic amount of nanosized magnetite (Fe3O4). The catalyst was easily removed by using an external magnet. The structures of the products were deduced from their 1H NMR, 13C NMR, and infrared