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Tunable catalytic annulation reactions of β alkynyl ketones with indoles have been developed, enabling multiple chemical bond‐forming events to selectively access skeletally diverse indole‐containing heterocycles with generally good yields. Silver‐catalyzed intermolecular benzannulation reaction of β‐alkynyl ketones with indoles afforded tetracyclic benzo[b]carbazoles whereas isochromen‐1‐yl‐substituted...
An interesting base-controlled protocol for the divergent and atom-economic synthesis of benzo[b]fluorenones and benzo[b]fluorenols with the great diversity in substitution patterns has been developed. Started from readily available 1,6-enynes, good to excellent yields of the corresponding tetracyclic benzo[b]fluorenones and benzo[b]fluorenols can be chemoselectively achieved under metal-free conditions...
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