Methyl 6β-phenoxyacetamido-6α-trichloroethoxyformamidopenicillanate has been converted into a 6α-aminopenicillanate; 6α-ethoxyformamido-6β-phenoxyacetamidopenicillanates reacted with phosgene and base to afford unique (1-ethoxycarbonyl-3-phenoxyacetyl-2-oxo-1,3-diazetidine)-4-spiro-6′-penicillanates.
D. H. Bremner, M. M. Campbell and G. Johnson, J. Chem. Soc., Chem. Commun., 1976, 293 DOI: 10.1039/C39760000293
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