Abstract
CuOTf-catalyzed substituent-controlled cascade [2 + 2 + 2] and [4 + 2] annulation reactions among heterocumulenes, alkynes, and diaryliodonium salts were achieved. Various quinoline derivatives could be obtained in good yields with excellent selectivity. This methodology provided a novel pathway to activate heterocumulenes via a unique highly reactive cationic intermediate. The reaction process was well elucidated by density functional theory calculations.
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