Intermolecular [3+2] Cycloaddition of Cyclopropylamines with Olefins by Visible‐Light Photocatalysis

It's the power of light! A visible-light-mediated intermolecular [3+2] cycloaddition of mono- and bicyclic cyclopropylamines with olefins catalyzed by [Ru(bpz)3](PF6)2⋅2 H2O has been developed to furnish aminocyclopentane derivatives in good yields (see scheme, bpz=2,2′-bipyrazine). Saturated 5,5- and 6,5-fused heterocycles are obtained in synthetically useful yields and diastereoselectivity.