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Abstract
Aza-Prins and the pauper: Aza-Prins cyclization between γ,δ-unsaturated tosylamines and aldehydes was successfully performed under solvent-free and metal-free conditions. When applied to β,γ-unsaturated sulfonamides, the corresponding δ-sultams were isolated in good yields (see scheme). This approach constitutes a new route to cyclic sulfonamides.
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