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The enantio- and diastereoselective formation of indenes spirofused to highly substituted cyclopropanes is described. The application of a new cinchona alkaloid derived ammonium salt in a phase transfer catalysis setup facilitates high selectivity and excellent yields at low catalyst loadings (0.1–1.0 mol%).

Graphical abstract: Enantioselective formation of cyclopropane spiroindenes from benzofulvenes by phase transfer catalysis

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