Rhodium-catalyzed selective [2 + 2 + 2] cyclizations of 1,6-diynes with monoynes leading to isoindol

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A highly efficient and selective [2 + 2 + 2] cyclization of diynes and monoalkynes was catalyzed by rhodium under room temperature in water/THF mixed solvent, affording isoindolines and isobenzofurans in good to excellent yields. The center atoms (N, O) in the diynes showed a significant effect for the cyclization.
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