Penicillin G sulphoxide on reaction with trifluoroacetic anhydride gave, in high yield, a novel tricyclic spiroderivative. Reaction with toluene-α-thiol gave S-benzyl thioformate and (2S,5S)-2-benzylthiocarbonyl-6,6-dimethyl-3-phenylacetyl-5-trifluoroacetamido-1,3-thiazin-4-one.
A. G. M. Barrett, J. Chem. Soc., Perkin Trans. 1, 1979, 170 DOI: 10.1039/P19790000170
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