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.
Key words
cyclizations - dienes - alkenes - rhodium - transition metals
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