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DOI: 10.1055/s-0028-1087973
Rhodium(I)-Catalyzed Cycloisomerization of 1,3-Dienes with Alkenes in a Tether
Publikationsverlauf
Publikationsdatum:
24. Februar 2009 (online)

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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The [4+2] cycloaddition of 3b or 3i was independently reported by Livinghouse (3b and 3i) and Gilbertson(3b) (see ref. 5) with the formation of the same [4+2] adduct 5b or 5i. The spectral data of 5b and 5i obtained by us were identical with those reported.