Abstract
Synthesis of cyclohexadienone spiro-fused sultams is established through electrochemical brominative intramolecular ipso-annulation of N-aryl alkynyl sulphonamides. A range of aryl/heteroarylated-alkynyl sulphonamides are suitable under external oxidant-free electrochemical conditions. Lithium bromide is used as bromine source in this domino bromination/ipso-cyclization, leading to the corresponding bromo spiro-sultams in good yields.
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