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Generating Complexity from Simplicity: Pd-Catalyzed or Cu-Promoted Domino Alkyne Homocoupling/Double [2+2] Allenyne Cycloaddition

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An efficient Pd–Cu bimetallic catalyzed or Cu-promoted preparation of attached-ring bis(heterocyclic) fused cyclobutenes in a totally controlled fashion by using alkyne homocoupling, as well as a double [2+2] cyclization of the resulting bis(allenyne) in a domino sequence has been accomplished (see scheme).

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