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A highly efficient copper‐catalyzed one‐pot tandem protocol has been developed for the synthesis of naphtho‐fused imidazo[1,2‐a]pyridines. The transformation involves a Knoevenagel condensation followed by a chemoselective cross‐coupling reaction along with a carbon‐carbon bond cleavage. This protocol can tolerate a variety of functional groups and provided naphtho[1′,2′:4,5]imidazo[1,2‐a]pyridines in moderate to excellent (35–91 %) yields. The photophysical studies of the naphtho‐fused imidazo[1,2‐a]pyridines show a bathochromic shift between the band maxima of the absorption and emission spectra. These compounds emit with high fluorescence quantum yields.
Asian Journal of Organic Chemistry – Wiley
Published: Dec 1, 2015
Keywords: ; ; ; ;
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