Abstract
AbstractRhodium(I)‐catalyzed cyclization of allenyl aldehydes with various alkynes was investigated. The cyclizations of internal alkynes that have both an electron‐rich aromatic ring and an electron‐withdrawing group at the terminus afforded [2+2+2] cycloaddition products in good yields with good to high regio‐ and enantioselectivity, while the reactions of terminal alkynes gave dienyl ketones instead of [2+2+2] cycloaddition products in good yields. These results indicate that the nature of the alkynes greatly influences the reaction course.
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