A highly tunable radical-mediated reaction system for the functionalization of tertiary aliphatic C–Hbonds was developed. Reactions of various substrates with the Zhdankin azidoiodane reagent 1, Ru(bpy)3Cl2, and visible light irradiation at room temperature gave C–H azidated or halogenated products in an easily controllable fashion. These reactions are efficient, selective, and compatible with complex
azidation of unactivated aliphatic C–H bonds with easily handled sulfonylazides as azide source without the use of transitionmetals has been explored. This method is operationally simple, scalable, and applicable to late-stage azidation of natural products and derivatives, which make it a valuable method for the synthesis of organic azides.
Site Selective Chlorination of C(sp
<sup>3</sup>
)−H Bonds Suitable for Late‐Stage Functionalization
作者:Alexander Fawcett、M. Josephine Keller、Zachary Herrera、John F. Hartwig
DOI:10.1002/anie.202016548
日期:2021.4.6
biologically active small molecules, and an ideal route for their preparation is by the chlorination of a C(sp3)−H bond. However, most current methods for the chlorination of C(sp3)−H bonds are insufficiently site selective and tolerant of functional groups to be applicable to the late‐stage functionalization of complex molecules. We report a method for the highly selective chlorination of tertiary and benzylic
Mechanistic Investigation of the Iron-Catalyzed Azidation of Alkyl C(<i>sp</i><sup>3</sup>)–H Bonds with Zhdankin’s λ<sup>3</sup>-Azidoiodane
作者:Craig S. Day、Alexander Fawcett、Ruchira Chatterjee、John F. Hartwig
DOI:10.1021/jacs.1c07330
日期:2021.10.6
resultant alkylradical then combines rapidly with a resting state iron(III)-azide complex, which is generated by the reaction of the λ3-azidoiodane with the iron(II)(pybox) complex, to form the C(sp3)–N3 bond. This mechanism is supported by the independent synthesis of well-defined iron complexes characterized by cyclic voltammetry, X-ray diffraction, and EPR spectroscopy, and by the reaction of the
C–H Azidation is an increasingly important tool for bioconjugation, materials chemistry, and the synthesis of nitrogen-containing natural products. While several approaches have been developed, these often require exotic and energetic reagents, expensive photocatalysts, or both. Here we report a simple and general C–H azidation reaction using earth-abundant tetra-n-butylammonium decatungstate as a