Pd-Catalyzed Regioselective Arylation on the C‑5 Position of <i>N</i>‑Aryl 1,2,3-Triazoles


We herein report a highly efficient method for the arylation at the C-5 position of <i>N</i>-aryl 1,2,3-triazoles via a direct palladium catalyzed arylation reaction. The optimal reaction conditions required a combination of Pd­(OAc)<sub>2</sub> and tris­(<i>o</i>-tolyl)­phosphine as catalyst, and Cs<sub>2</sub>CO<sub>3</sub> as the base under inert atmosphere. A variety of C-5 substituted <i>N</i>-aryl 1,2,3-triazoles were prepared using these conditions with yields in the 70–88% range. Regioselective C-5 arylations were also performed on 1,4-disubstituted 1,2,3-triazoles. The regioselectivity in triazole substitution at the C-5 position was confirmed by single crystal XRD. In addition, computational investigations of key steps of the catalytic cycle using the density functional theory have provided a rationalization to the selective C-5 arylation of <i>N</i>-aryl 1,2,3-triazoles

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Last time updated on 12/02/2018

This paper was published in FigShare.

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