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The cyclization reactions of 2,3-allenoic acids or their salts with optically active bases affording butenolides are discussed. Two reaction pathways were observed: (1) intermolecular carbometallation-intramolecular allylation; (2) cyclic oxymetallation-reductive elimination. High efficiency of chirality transfer was realized with the latter case.

Recent advances in transition metal-catalyzed or -mediated cyclization of 2,3-allenoic acids: New methodologies for the synthesis of butenolides