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Seleniranium ions at low temperatures (-90 to -78 degrees C) will initiate effective Friedel-Crafts cyclization if a suitably placed arene is allowed to react even when the arene is unactivated. These intermediates generated from N-aryl-N-tosylamides undergo a novel, surprisingly efficient, detosylative cyclization to form 5- or 6-membered nitrogen heterocycles. A debenzylation route is preferred if both benzyl and tosyl groups are present in the substrate.

Seleniranium Ion-Triggered Reactions: New Aspects of Friedel−Crafts and N-Detosylative Cyclizations