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Azetidine derivatives R 0045 β-Lactam Derivatives as Enzyme Inhibitors: Halogenated β-Lactams and Related Compounds. -A variety of substituted β-lactams are synthesized from appropriate imines (I) via Reformatsky-like [→(III)] or modified Staudinger reactions. Some of the products show weak activity as elastase inhibitors. Attempts to alkylate N-benzyl-−β-lactams such as (XII) at the 3-position result in an unexpected rearrangement furnishing pyrrolidinone derivatives (XIII). -(ELRIATI, A.; LOOSE, J.; MAYRHOFER, R.; BERGMANN, H.-J.; OTTO*, H.-H.; Monatsh. Chem. 139 (2008) 7, 835-846; Inst. Pharm./Med.