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The N‐heterocyclic carbene catalyzed [8+2] oxidative annulation of tropone with aldehydes was developed, giving cycloheptatriene‐fused furanones in moderate to good yields. Further reduction of the cycloadducts afforded cycloheptane‐fused furanones and dihydrofuranones in good yields.
A facile cycloaddition reaction of 8,8-dicyanoheptafulvene with styrenes leading to the corresponding [8+2] and [4+2] adducts in excellent yields is described.
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