In my thesis, I described the synthesis of N-functionalized 2-pheny-1H-imidazoles and their ortho functionalization via C–H activation with a ruthenium catalyst. I presented the properties of 2-phenylimidazole, synthesis of N-functionalized 2-phenylimidazoles, classic cross coupling reactions and catalytic direct functionalization aided by directing groups, and mechanism of ruthenium-catalyzed reactions. With my experiments I wanted to study the influence of different functional groups on imidazole for direct C–H functionalization. In the first reaction step I synthesized N-substituted substrates with procedures from the literature. I used these products and reacted them with chlorobenzene and [Ru(p-cimen)Cl$_2$]$_2$ catalyst. With the purpose of optimization, I changed the solvents and added ligands KOPiv and PPh$_3$. I found out that the best solvent is water and that there is no need to add ligands. Different functional groups influence the ration of mono- and diarylated products.
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