N‐Heterocyclic Carbene Catalyzed Generation and [4+2] Annulation of Unsubstituted Dienolate – Enantioselective Synthesis of Spirocyclic Oxindolodihydropyranones

The N-heterocyclic carbene catalyzed (NHC-catalyzed) generation of unsubstituted dienolate (butadienolate) and subsequent [4+2] annulation reactions with isatins afford chiral spirocyclic oxindolodihydropyranones in moderate to good yields with moderate to good enantioselectivities.

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