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Made up out of air: The highly enantioselective oxidation of 3,4‐substituted meso‐pyrrolidines to Δ1‐pyrrolines is reported. The reaction is catalyzed by monoamine oxidase from Aspergillus niger (MAO‐N D5) and utilizes molecular oxygen from air as the stoichiometric oxidant. The corresponding Δ1‐pyrrolines serve as useful building blocks for the synthesis of L‐proline analogues and α‐amino nitriles...
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