Domino Aza-Claisen—Mannich Cyclization Reaction from a Chiral α-Alkoxy Enamine or Sequential Alkylation of an α-Alkoxy Ester Enolate or Nitrile Anion, Followed by an Intramolecular Wittig Reaction: Two [3 + 2] Annulation Routes to Homochiral 4-Alkyl-4-hydroxy-2-cyclopentenone Synthesis.

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