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β-Lactams are formed from β-hydroxy amides by base-promoted cyclization of the β-methylsulfonoxyamide. In the system studied, this amide-based mesylate cyclization proceeded in high yields, whereas the analogous β-chloroamide afforded only the α,β-unsaturated amide. Also, two new methods of synthesizing carbacephams by annulation of malonate-substituted β-lactams were demonstrated. The first was...
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