N-Methylphthalimide-substituted benzimidazolium salts and PEPPSI Pd-NHC complexes: synthesis, characterization and catalytic activity in carbon-carbon bond-forming reactions


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Akkoc S. , GÖK Y., İLHAN I. Ö. , Kayser V.

BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY, vol.12, pp.81-88, 2016 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 12
  • Publication Date: 2016
  • Doi Number: 10.3762/bjoc.12.9
  • Title of Journal : BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
  • Page Numbers: pp.81-88

Abstract

A series of novel benzimidazolium salts (1-4) and their pyridine enhanced precatalyst preparation stabilization and initiation (PEPPSI) themed palladium N-heterocyclic carbene complexes [ PdCl2(NHC)(Py)] (5-8), where NHC = 1-(N-methylphthalimide)3- alkylbenzimidazolin-2-ylidene and Py = 3-chloropyridine, were synthesized and characterized by means of H-1 and C-13{H-1} NMR, UV-vis (for 5-8), ESI-FTICR-MS (for 2, 4, 6-8) and FTIR spectroscopic methods and elemental analysis. The synthesized compounds were tested in Suzuki-Miyaura cross-coupling (for 1-8) and arylation (for 5-8) reactions. As catalysts, they demonstrated a highly efficient route for the formation of asymmetric biaryl compounds even though they were used in very low loading. For example, all compounds displayed good catalytic activity for the C-C bond formation of 4-tert-butylphenylboronic acid with 4-chlorotoluene.