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The N‐arylsulfonyl group, which is the best and most useful cyclization auxiliary for the transition‐metal‐catalyzed atom transfer radical cyclization (ATRC) of N‐allyl‐α‐polychloroamides, can be effectively removed from the target γ‐lactams by using H2SO4–HOAc, without impairing the halogen functions. The reaction involves H+ attack on the aromatic moiety, and is strongly responsive to the electronic...
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