Synthesis of a cephalosporin analogue

Abstract
The recently developed photolytic Wolff rearrangement of 3-diazopyrrolidine-2,4-diones for the synthesis of β-lactams has been used to prepare cis(6H,7H)-8-oxo-7-phenylacetamido-1-aza-4-thiabicyclo[4.2.0]oct-2-ene-2-carbaldehyde (3; R = CHO), which showed antibacterial activity against Staphylococcus aureus.

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