Abstract
AbstractA method for synthesizing 4,7‐diarylindoles and 4,7‐di(thien‐2‐yl)indole by applying a strategy where the fused benzene ring was built on an existing pyrrole in an acid‐catalyzed rearrangement of 1,4‐diaryl‐1,4‐di(pyrrol‐2‐yl)but‐2‐yne and 1,4‐di(pyrrol‐2‐yl)‐1,4‐di(thien‐2‐yl)but‐2‐yne, respectively, is presented. In the presence of TFA (30 equiv.), 4,7‐diarylindoles undergo thermodynamically equilibrated dimerization at 240 K as determined by 1H NMR spectroscopy and substantiated by DFT calculations.
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