Abstract
A rhodium(I)-catalyzed cycloisomerization of 1,3-dienes with alkenes in a tether proceeded smoothly, giving cyclopentene or cyclohexene derivatives in good yields. The existence of a hetero atom between the 1,3-diene moiety and the olefin in the tether affected the reaction course. In the case of the substrate having no hetero atom between the 1,3-diene moiety and olefin in the tether, cycloisomerization reaction proceeded, giving the corresponding cyclic product. On the other hand, in the case of the substrate having a hetero atom between the 1,3-diene moiety and olefin in the tether, the reaction course was completely changed to give a [4+2] cycloaddition product.
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