Copper‐Catalyzed Tandem Cyclization Approach to N,O‐Chelated Boron Difluoride Complexes

A strategy for synthesizing N,O‐chelated boron difluoride complexes via copper‐catalyzed tandem cyclization of readily available 2‐aryl pyridines has been developed. This reaction tolerates a wide range of functional groups, providing the corresponding products in 43–91% yield. Furthermore, the photophysical properties were investigated by measuring the UV/Vis absorption and fluorescence spectra of several product derivatives. An efficient copper‐catalyzed tandem cyclization of readily available substituted 2‐arylpyridine with Cu(BF4)2.6H2O have been developed to afford N, O‐chelated boron difluoride complexes in good yields with excellent regioselectivity.