The synthesis of (±)-8-oxo-7β-phenylacetamido-7α-methyl-6αH-1-aza-4-thiabicyclo[4,2,0]octane-2α-carboxylic acid (5; R1= H, R2= Ph·CH2·CONH) and (±)-8-oxo-7β-phenylacetamido-7α-methyl-6αH-1-aza-4-thiabicyclo[4,2,0]oct-2-ene-2-carboxylic acid (6; R1= H, R2= Ph·CH2) are described.
D. M. Brunwin and G. Lowe, J. Chem. Soc., Chem. Commun., 1972, 589 DOI: 10.1039/C39720000589
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