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Herein, we describe the copper-catalyzed aerobic C(sp3)–H functionalization of 2-alkylbenzamides for the synthesis of benzolactones. This reaction proceeds via 1,5-hydrogen atom transfer of N-centered radicals directly generated by N–H bond cleavage and does not require the synthesis of pre-functionalized N-centered radical precursors or the use of strong stoichiometric oxidants.

Graphical abstract: Copper-catalyzed aerobic benzylic C(sp3)–H lactonization of 2-alkylbenzamides via N-centered radicals

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