Bypassing β-Hydride Elimination: Excited-State Pd-Catalyzed C(sp3)-C(sp2) Coupling at Room Temperature.

Catalytic modification of C-H bonds using palladium is highly appealing, but transformations involving alkyl-Pd(II) intermediates with β-hydrogens are challenging due to the propensity for β-hydride elimination. To address this, selective arylation of sp3 C-H bonds in amides and alcohols has been achieved using divalent palladium as an excited-state transition metal (TM) species at room temperature. Our approach unveils a non-redox-neutral pathway to achieve C(sp3)-C(sp2) cross-couplings, utilizing aryl iodides as both hydrogen atom transfer (HAT) and arylating agents for the first time under Pd-photochemical conditions. The mechanism involves photo-induced Pd(II)-catalyzed aryl radical generation, HAT, and aryl migration, effectively bypassing the common β-hydride elimination and annulation pathways. Mechanistic investigations using isotope-labeled compounds and density functional theory (DFT) studies support the mechanistic rationale, affirming both the feasibility and intricacies of this effective transformation.

• Publication year

  2025

• Venue

  Angewandte Chemie

• Publication date

  2025-11-10

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.1002/anie.202522979PMID 41208650
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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