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Keywords:

  • acyliminium ion;
  • alkaloids;
  • asymmetric catalysis;
  • cyclization;
  • organocatalysis

During the preparation of this Communication we failed to reference a relevant article by Córdova and co-workers, which should be included in reference 11. It should also be noticed that in this article an enantioselective organocatalytic synthesis of 5-hydroxyproline derivatives from 2-amidomalonates and α,β-unsaturated aldehydes is described. The authors apologize for this oversight.