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A simple and green procedure was established by [3 + 3] cycloaddition reaction of isatin derived cyclic imine 1,3-dipoles with α,β-unsaturated aldehydes, giving spirooxindoles with aza-quaternary center in good yields and diastereoselectivities.

1,3-Dipolar cycloaddition of isatin N,N′-cyclic azomethine imines with α,β-unsaturated aldehydes catalyzed by DBU in water