Bisulfate Salt-Catalyzed Friedel–Crafts Benzylation of Arenes with Benzylic Alcohols
作者:Ren-Jin Tang、Thierry Milcent、Benoit Crousse
DOI:10.1021/acs.joc.8b02361
日期:2018.11.16
We report here a method of direct Friedel–Craftsbenzylation of arenes with benzylic alcohols using cheap and readily available bisulfate salt as the catalyst in hexafluoroisopropanol. The catalytic system is powerful with a quite diverse group of functionalized arenes and benzylic alcohols. These mild conditions provide a straightforward synthesis of a variety of unsymmetrical diarylmethanes in high
Green, Mild, and Efficient Friedel–Crafts Benzylation of Scarcely Reactive Arenes and Heteroarenes under On‐Water Conditions
作者:Pellegrino La Manna、Annunziata Soriente、Margherita De Rosa、Antonio Buonerba、Carmen Talotta、Carmine Gaeta、Placido Neri
DOI:10.1002/cssc.201900137
日期:2019.4.23
The catalytic strategy exploits the hydrophobicity of the resorcinarene macrocycle 1 a. The proposed mechanism is based on the activation of benzylchloride by H‐bonding interactions with catalyst 1 a. In fact, under on‐water conditions the hydrophobic amplification of the strength of the H‐bonding interactions between the OH groups of the resorcinarene catalyst and the chlorine atom of benzyl chloride
Two sequential nickel-catalyzed reactions allow the preparation of highly functionalized alkylidene cyclohexenols. Dehydration of the resulting cycloadducts allows the preparation of densely functionalized aromatic ring systems, whereas a simple sequence involving oxidation followed by carbonyl addition or enolization allows additional diversity incorporation.