ChemInform Abstract: Phosphine-Catalyzed Asymmetric [4 + 2] Annulation of Vinyl Ketones with Oxindole-Derived α,β-Unsaturated Imines: Enantioselective Syntheses of 2′,3′-Dihydro-1′H-spiro[indoline-3,4′-pyridin]-2-ones.

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