Electrocatalytic Activation of Donor–Acceptor Cyclopropanes and Cyclobutanes: An Alternative C(sp<sup>3</sup>)−C(sp<sup>3</sup>) Cleavage Mode
Simon Kolb, Martin Petzold, Felix Brandt, Peter G. Jones, Christoph R. Jacob, Daniel B. Werz
Abstract
Abstract We describe the first electrochemical activation of D–A cyclopropanes and D–A cyclobutanes leading after C(sp 3 )−C(sp 3 ) cleavage to the formation of highly reactive radical cations. This concept is utilized to formally insert molecular oxygen after direct or DDQ‐assisted anodic oxidation of the strained carbocycles, delivering β‐ and γ‐hydroxy ketones and 1,2‐dioxanes electrocatalytically. Furthermore, insights into the mechanism of the oxidative process, obtained experimentally and by additional quantum‐chemical calculations are presented. The synthetic potential of the reaction products is demonstrated by diverse derivatizations.
Topics & Concepts
Cleavage (geology)CyclobutanesChemistryTetradAcceptorStereochemistryCatalysisOrganic chemistryMaterials scienceBotanyPhysicsCycloadditionBiologyComposite materialFracture (geology)Condensed matter physicsCyclopropane Reaction MechanismsCatalytic C–H Functionalization MethodsAsymmetric Hydrogenation and Catalysis