We report a method that ensures the selective alkylation of benzamides and aromatic ketones at the para-position via cooperative nickel/aluminum catalysis. Using a bulky catalyst/cocatalyst system allows reactions between benzamides and alkenes to afford the corresponding para-alkylated products. The origin of the high para-selectivity has also been investigated by density functional theory calculations
Lewis Acid‐Catalyzed Nucleophilic Substitutions of Benzylic Alcohols with Sulfamides
作者:Ryoga Oda、Kenya Nakata
DOI:10.1002/ejoc.202001320
日期:2021.1.15
Sulfamidation of benzylic alcohols was achieved for the first time using nucleophilicsubstitutions catalyzed by FeCl3, as a Lewis acid. A variety of N‐benzyl‐substituted sulfamides were produced efficiently by this novel protocol.
Co(III)-Catalyzed Synthesis of Quinazolines via C–H Activation of <i>N</i>-Sulfinylimines and Benzimidates
作者:Fen Wang、He Wang、Qiang Wang、Songjie Yu、Xingwei Li
DOI:10.1021/acs.orglett.6b00227
日期:2016.3.18
as a synthon of nitriles, and subsequent coupling with arenes such as N-sulfinylimines and benzimidates bearing a functionalizable directing group provided facile access to two classes of quinazolines under Co(III)-catalysis.
Tin(IV) bromide was found to act as an efficient Lewis acid catalyst for the Friedel–Crafts type dehydrative alkylation reaction of diarylmethanols with 2-naphthol derivatives under mild conditions. The effects of the substituents on the substrates were systematically evaluated, and the reaction could be applied to a variety of substrates by tuning the conditions depending on the electronic properties
Dications of Fluorenylidenes. The Relationship between Redox Potentials and Antiaromaticity for Meta- and Para-Substituted Diphenylmethylidenefluorenes
作者:Nancy S. Mills、Cornelia Tirla、Michele A. Benish、Amber J. Rakowitz、Lisa M. Bebell、Caroline M. M. Hurd、Anna L. M. Bria
DOI:10.1021/jo051599u
日期:2005.12.1
donation in these systems. A strong correlation between NICS and σ constants suggests that factors that affect the magnitude of the charge on the benzylic (α) carbon of the diphenylmethylcation affect the antiaromaticity of the fluorenyl cation. Calculated atomic charges on carbons 1−8 and 10−13 show an increase in positivecharge, and therefore greater delocalization of charge in the fluorenyl system