Enlargement of the thiazolidine ring of penicillanic acid derivatives
Abstract
6β-Phthalimidopenicillanoylchloromethane undergoes a base-promoted rearrangement to a mixture of 4-isopropylidene-3-oxo-7β-and 4-isopropylidene-3-oxo-7α-phthalimidocepham.
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