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Synthesis of 2-Azapyrenes and their Photophysical and Electrochemical Properties.

A series of 5,7,9-substituted 2-azapyrenes were synthesized for the first time. The synthesis relies on Brønsted acid promoted benzannulation of alkyne precursors prepared by palladium-catalyzed cross-coupling reactions. The synthetic strategy is efficient and the scope covers a variety of functional groups. The electrochemical behavior and photophysical properties of the products were investigated by UV-Vis and fluorescence spectroscopy, cyclic voltammetry and DFT calculations.