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Here we report a secondary amine‐catalyzed, highly enantioselective [3+3] cyclization reaction of α‐alkylidene pyrazolinones and α,β‐unsaturated aldehydes, which facilely delivers a variety of enantioenriched spiropyrazolones showing structural and stereochemical complexity. The reaction uses an iminium ion activation strategy to activate both the β‐ and ipso‐positions of the enals as dielectrophilic...
The front cover picture, provided by Jun‐Long Li, Bo Han and co‐workers, illustrates an efficient asymmetric synthesis of structurally and stereochemically complex spiropyrazolones from simple, readily available starting materials. This approach is atom‐economic, environmentally benign and compatible with many functional groups. It supports gram‐scale production and diversity‐oriented synthesis. This...
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