Oxidative Arylation with Heteroarenes Uses Visible Light

   2019-03-13 00:03

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The oxidative coupling between two compounds with C–H bonds is a general approach to creating C–C bonds. It can, for example, be used for the synthesis of alkylated heteroaromatic compounds. This reaction usually is performed using both a photocatalyst and stoichiometric peroxides.

Aiwen Lei and colleagues, Wuhan University, China, have developed a visible-light-induced selective C(sp3)–H arylation with heteroarenes (example product pictured), mediated by Selectfluor. Selectfluor or N-Chloromethyl-N‘-fluorotriethylenediammonium bis(tetrafluoroborate) is usually used as a fluorination reagent and oxidant. The team found that the compound can be activated by blue LED light to give a radical cation centered at nitrogen. This radical can abstract a hydrogen atom from, e.g., an alkane to induce the coupling with a heteroarene. This step is followed by a one-electron oxidation to give the final product.



The team used this approach to couple different cycloalkanes, ethers, or aryl-substituted alkanes with heteroarenes such as quinolines or benzothiazoles. The desired products were obtained in good to excellent yields. The reaction can be performed on a gram scale and needs no external photocatalysis.


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