Cephalosporin 3′-triphenylphosphonium ylide (1) reacted with acrylaldehyde to give the C-3,C-4 tricyclic compound (3), while the sulphoxide of the ylide (1) upon similar treatment gave the C-2,C-3 tricyclic compound (4) which was converted into the ring-fused analogue (7) of nocardicin; desulphurization of this compound afforded the nocardicin nucleus (10)
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