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The Friedel‐Craft reaction belongs to the Diels‐Alder type set of reactions, and pyrroles, indoles, and aniline react readily with α,β‐unsaturated aldehydes in the presence of MacMillan’s catalyst to afford the products with excellent enantioselectivity (Eq. 1.18) [40]. [3+2] Nitrone cycloaddition also belongs to this type of reaction [41].

(1.18)