N-aryl-3,3-difluoroazetidin-2-ones featured by a latent electrophilic methylene quinoniminium function have been synthesized and evaluated as inhibitors of human leucocyte elastase. To promote hydrophobic interactions with the enzyme, to increase the rates of beta-lactam ring opening and of benzylic group departure, or to induce hydrosolubility, these compounds incorporate on their aromatic ring either an alkyl moiety, a methoxy substituent or a carboxylic group. Some of these beta-lactams proved to be good inactivators of human leucocyte elastase.
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