Organocatalytic Asymmetric Michael–Michael Cascade for the Construction of Highly Functionalized N‑Fused Piperidinoindoline Derivatives

Application of indolin-3-one derivatives in a cascade reaction for efficient assembly of complex molecules is a much less explored research area. It is demonstrated that structurally interesting polysubstituted piperidino­[1,2-a]­indoline compounds containing four contiguous stereocenters including one tetrasubstituted carbon center can be readily obtained with good yields (up to 94% yield) and excellent enantioselectivities (up to >99% ee) by employing indolin-3-one derivatives as substrates via bifunctional catalysis.