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Forming Benzylic Iodides Via a Nickel Catalyzed Dearomative Carboiodination Reaction of Indoles.
Angewandte Chemie 2019 Februrary 21
A diastereoselective dearomative carboiodination reaction is reported. We report a novel metal-catalyzed approach to install reactive secondary benzylic iodides. Utilizing the unique reactivity of nickel, we have expanded the carboiodination reaction onto non-activated aromatic double bonds forming a previously unattainable class of iodides. We also report a broadly applicable method to avoid the use of a metallic reducing agent by utilizing an alkyl phosphite as the ligand. The reaction is thought to proceed through a syn intramolecular carbonickelation onto a 2-substituted indole followed by a diastereoretentive reductive elimination of the carbon-iodine bond. The complex iodinated indolines generated in the reaction were obtained in moderate to good yields and good to excellent diastereoselectivity. The products were easily functionalized via a variety of synthetic methods.
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