Exocyclic bromination of N-substituted β- and γ-lactams
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Regioselective halogenation of the N-susbtituted lactams (3a)-(3d) affords the corresponding exocyclic bromides (4a)-(4d). The procedure provides a novel alternative route to N-(α-haloalkyl)-substituted lactams, which are of particular interest in the synthesis of β-lactam antibiotics.
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Tetrahedron Letters