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The [2+2]cycloaddition of chlorosulfonyl isocyanate to vinyl and (Z)-propenyl ethers derived from the 2-O-sulfonylated (R)- and (S)-1-(furyl-2')-1,2-ethanediols furnished the 4-alkoxy-azetidin-2-ones with a good to moderate stereoselectivity. The intramolecular alkylation of the beta-lactam nitrogen atom led to the corresponding 3-(furyl-2')- and 6-methyl-3-(furyl-2')-clavams. The transformation of the furyl residue into an alkoxycarbonyl group led to clavams related to the natural compounds. The synthesized clavams exhibited moderate inhibitory activities against DD-peptidase 64-575 and beta-lactamase (penase) as well as antifungal activities.

Synthesis of 3-Substituted-clavams: Antifungal Properties, DD-Peptidase and β-Lactamase Inhibition