Organocatalytic stereoselective [8+2] and [6+4] cycloadditions
2017
Higher-order cycloadditions — cycloadditions involving more than six π electrons — provide easy access to complex molecules containing heterocyclic or carbocyclic scaffolds. Now, it has been shown that aminocatalytic activation of 2-cycloalkenones affords mixtures of dienamines that can undergo [6 + 4] cycloadditions with heptafulvenes through a cross dienamine, or [8 + 2] cycloadditions through a linear dienamine.
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