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. 2016 Mar 18;22(13):4379-83.
doi: 10.1002/chem.201600329. Epub 2016 Feb 16.

Copper-Catalyzed Intramolecular Oxidative Amination of Unactivated Internal Alkenes

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Copper-Catalyzed Intramolecular Oxidative Amination of Unactivated Internal Alkenes

Peng Xiong et al. Chemistry. .

Abstract

A copper-catalyzed oxidative amination of unactivated internal alkenes has been developed. The Wacker-type oxidative alkene amination reaction is traditionally catalyzed by a palladium through a mechanism involving aminopalladation and β-hydride elimination. Replacing the precious and scarce palladium with a cheap and abundant copper for this transformation has been challenging because of the difficulty associated with the aminocupration of internal alkenes. The combination of a simple copper salt, without additional ligand, as the catalyst and Dess-Martin periodinane as the oxidant, promotes efficiently the oxidative amination of allylic carbamates and ureas bearing di- and trisubstituted alkenes leading to oxazolidinones and imidazolidinones. Preliminary mechanistic studies suggested a hybrid radical-organometallic mechanism involving an amidyl radical cyclization to form the key C-N bond.

Keywords: copper; cyclization; oxidation; radicals; synthetic methods.

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