Transition metal-catalyzed intermolecular [5+2] and [5+2+1] cycloadditions of allenes and vinylcyclopropanes.

作者： Hermann A. Wegner , Armin de Meijere , Paul A. Wender

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摘要: Initial examples of the intermolecular Rh(I)-catalyzed [5+2] cycloaddition reaction bifunctional allenes and vinylcyclopropanes are described. The reactions proceed with facility in yields up to 99% a variety alkyne-, ester-, styrene-, or cyano-substituents on allene afford corresponding cycloadducts. In presence CO, proceeds an eight-membered ring cycloadduct its transannularly closed product, providing first example three-component [5+2+1] allenes.

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Transition metal-catalyzed intermolecular [5+2] and [5+2+1] cycloadditions of allenes and vinylcyclopropanes.

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Transition metal-catalyzed intermolecular [5+2] and [5+2+1] cycloadditions of allenes and vinylcyclopropanes.

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