Fe(ClO4)3·×H2O-Catalyzed direct C–C bond forming reactions between secondary benzylic alcohols with different types of nucleophiles
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1016/j.tet.2010.02.063
日期:2010.4
mild and efficient Fe(ClO4)3·×H2O-catalyzed direct C–C bond coupling reactions of 1,3-dicarbonyl compounds, electron-rich arenes and heteroarenes and 4-hydroxycoumarin with secondary benzylic alcohols have been described. The benzylation of electron-rich arenes and heteroarenes leads to the synthesis of bis-symmetrical triarylmethanes. The present method is also applied to synthesis of an anti-coagulant
Benzylation of β-dicarbonyl compounds and 4-hydroxycoumarin using TMSOTf catalyst: a simple, mild, and efficient method
作者:Palani Theerthagiri、Appaswami Lalitha
DOI:10.1016/j.tetlet.2010.08.019
日期:2010.10
The direct benzylation of 1,3-dicarbonyl compounds and 4-hydroxycoumarin with a wide variety of benzylic alcohols was achieved using trimethylsilyl trifluoromethanesulfonate as an efficient catalyst. The reaction proceeded under very mild conditions at room temperature providing the desired products in good to excellent yields.
Ionic Liquids with Multi‐Active Sites Synergistically Catalyzed Metal‐Free Transformation of Alcohols Using Dimethyl Carbonate as an Environmental Solvent
Pyridine-based ionicliquids with multiple activesitessynergisticallycatalyzed C3 substitution of 4-hydroxycoumarin with alcohols in dimethylcarbonate was demonstrated. The system was efficient, economic and environmental and successfully applied for the synthesis of coumatetralyl as commercial rodenticide. And a mechanism involving a SN1 pathway, synergistically promoted effect of hydrogen bonding