Skeletal diversity-oriented synthesis of cycloheptatriene[ b ]indole, spiro-cyclopentene[ b ]indole and carbazole derivatives via Pd-catalyzed sequential reaction involving indolyl allene intermediates

Herein, we report a Pd-catalyzed, base-controlled divergent cyclization strategy for the synthesis of polycyclic indole derivatives. Utilizing 3-propargyl indoles and ortho-iodophenyl-ynones as substrates, the reaction pathway can be tuned by...