Hydroxyphosphine ligand for nickel-catalyzed cross-coupling through nickel/magnesium bimetallic cooperation

Naohiko Yoshikai, Hirokazu Matsuda, Eiichi Nakamura

Research output: Contribution to journalArticlepeer-review

230 Citations (Scopus)

Abstract

We report here that hydroxyphosphine ligands (PO ligands) significantly accelerate nickelcatalyzed cross-coupling reactions of unreactive aryl electrophiles and Grignard reagents. The new catalytic system based on the nickel-PO-Grignard combination allows facile activation of unreactive aryl halides such as fluorides, chlorides, polyfluorides, and polychlorides as well as phenol derivatives such as carbamates and phosphates to give the corresponding cross-coupling products in good to excellent yields. We ascribe the high catalytic activity to a nickel phosphine/magnesium alkoxide bimetallic species that forms from the nickel precatalyst, the PO ligand, and the Grignard reagent and undergoes activation of the aryl-X bond by a cooperative push-pull action of the nucleophilic nickel and Lewis acidic magnesium centers. This mechanistic conjecture was corroborated by kinetic isotope effect experiments and density functional theory calculations. Being distinct from the conventional three-centered mechanism for oxidative addition, the proposed mechanism for the C-X bond activation offers a new concept for the design of cross-coupling reactions as well as other homogeneous catalyses involving activation of electrophilic substrates.

Original languageEnglish
Pages (from-to)9590-9599
Number of pages10
JournalJournal of the American Chemical Society
Volume131
Issue number27
DOIs
Publication statusPublished - 2009 Jul 15
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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