Iridium- and rhodium-catalyzed [2+2+2] cycloadditions of diynes with maleimide: a new synthetic route to highly substituted phthalimides.

[摘要]：The [2+2+2] cycloaddn. of maleimide with a,w-diynes in the presence of [IrCl(cod)]2 or [RhCl(cod)]2 and DPPE gives cyclohexadiene derivs. which are readily aromatized with DDQ or MnO2. This 2-step procedure gives access to highly substituted phthalimides in good yields.

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