An enantioselective β-lactam synthesis starting from L-(S)-glyceraldehyde acetonide

Complete diastereoselectivity is observed during the cyclocondensation of activated glycine derivatives with aldimines derived from L-(S)-glyceraldehyde acetonide. 3,4-cis-β-lactams are isolated in high optical and chemical yields. They are converted into key intermediates used in the syntheses of various mono- and bicyclic β-lactam antibiotics. A mechanism is suggested to explain this remarkable diastereoselectivity.

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