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A novel [3 + 2]-cycloaddition between azomethine imines and lithium ynolates is described to sdsdddddddyyynthesize bicyclic pyrazolidinones. These bicyclic pyrazolidinones are versatile intermediates to form β-amino acids and monocyclic pyrazolidinones. High diastereoselectivity and stereospecificity allow access to optically active products.

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