Aromatic transformations facilitated by η6–ruthenium complexes

Abstract

The chemistry of η6-arene metal complexes has been explored for over 60 years and the ability to activate arenes through this complexation has been used extensively in organic synthesis. As a result of binding to the metal, the complexed arene becomes more susceptible to nucleophilic attack and deprotonation of the aromatic and benzylic protons is made more facile. Additionally, binding a metal centre to one face of the arene subsequently has a steric effect on the reactivity, wherein the bound face is blocked from reagents and directs attack to the free face. Over the last 15 years, this area of organometallic chemistry has seen a resurgence of interest due to the catalytic capabilities of these complexes. Through an arene exchange mechanism, arenes can participate in reactions when bound to the metal catalyst, and can then exchange for another equivalent of starting material to facilitate catalytic turnover. This thesis will describe a number of projects that have been developed over three years that uses this methodology to perform transformations which are of significant interest to the scientific community.
Firstly, a trifluoromethylation protocol is described, which uses a [RuCp]+ binding unit to activate a range of electron-deficient arenes towards the nucleophilic attack of commercially available Me3SiCF3 (Ruppert’s Reagent). A library of complexes exhibit reaction, and a mixture of products are formed via SNAr and ortho-addition mechanisms. Following trifluoromethylation, the unbound arenes can be collected in quantitative yield using photolysis and chemical oxidation.
Secondly, a C–H activation and arylation protocol is described, where the same [RuCp]+ binding unit is used to enhance aromatic acidity of a η6-arene complexes. Through a concerted metalation deprotonation mechanism, a library of complexes can be activated by silver, and consequentially arylated using catalytic palladium chemistry. Following arylation, the bi-aryl arene can be liberated from ruthenium by UV irradiation.
The largest chapter of this thesis describes the catalytic radical hydrodeiodination of aryl iodides via an arene exchange mechanism. This reaction uses commercially available materials to achieve deiodination for iodoarenes in high yields and with excellent functional group tolerance and chemoselectivity.
Lastly, the early findings towards tether assisted arene exchange is described. The rates of arene exchange are studied for a library of tethered Cp ruthenium complexes, which show potential for enhanced arene exchange in catalytic reactions.