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Synthetic routes leading to [6,6,6]‐tricyclic compounds were reported using metal catalysts from ene‐yne‐aldehydes in our group. Based on this result, the synthesis of various [6,6,6]‐tricyclic compounds is reported using transition metal‐catalyzed cyclization from enyne‐carbonyl substrates containing H, Me, Ph, OMe, CO2Me, and CO2i‐Pr groups. Tricyclic compounds containing the CO2Me group would be the prospective precursors of the natural product Lepenine.

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