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Direct C(sp2)–H alkylation of unactivated arenes enabled by photoinduced Pd catalysis

Author

Listed:
  • Daeun Kim

    (Korea Advanced Institute of Science and Technology (KAIST)
    Seoul National University)

  • Geun Seok Lee

    (Korea Advanced Institute of Science and Technology (KAIST)
    Seoul National University)

  • Dongwook Kim

    (Korea Advanced Institute of Science and Technology (KAIST)
    Institute for Basic Science (IBS))

  • Soon Hyeok Hong

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Despite the fundamental importance of efficient and selective synthesis of widely useful alkylarenes, the direct catalytic C(sp2)–H alkylation of unactivated arenes with a readily available alkyl halide remains elusive. Here, we report the catalytic C(sp2)–H alkylation reactions of unactivated arenes with alkyl bromides via visible-light induced Pd catalysis. The reaction proceeds smoothly under mild conditions without any skeletal rearrangement of the alkyl groups. The direct syntheses of structurally diverse linear and branched alkylarenes, including the late-stage phenylation of biologically active molecules and an orthogonal one-pot sequential Pd-catalyzed C–C bond-forming reaction, are achieved with exclusive chemoselectivity and exceptional functional group tolerance. Comprehensive mechanistic investigations through a combination of experimental and computational methods reveal a distinguishable Pd(0)/Pd(I) redox catalytic cycle and the origin of the counter-intuitive reactivity differences among alkyl halides.

Suggested Citation

  • Daeun Kim & Geun Seok Lee & Dongwook Kim & Soon Hyeok Hong, 2020. "Direct C(sp2)–H alkylation of unactivated arenes enabled by photoinduced Pd catalysis," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19038-8
    DOI: 10.1038/s41467-020-19038-8
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