Chinese Journal of Catalysis ›› 2011, Vol. 32 ›› Issue (10): 1617-1623.DOI: 10.3724/SP.J.1088.2011.10617

• Research papers • Previous Articles     Next Articles

Preparation and Application of New P, N-Ligands for Palladium-Catalyzed C–N Bond Coupling Reaction

DAI Yao1, LIU Hesong2,a, FENG Xiujuan1,b, BAO Ming1   

  1. 1State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China; 2Department of Dermatology and Venereology, The First Hospital of Jilin University, Changchun 130021, Jilin, China
  • Received:2011-06-09 Revised:2011-06-28 Online:2011-09-30 Published:2015-02-12

Abstract: P,N-ligands (L1–L5) with cyclic secondary amine moieties linked to the benzene rings of triphenylphosphine were designed and synthesized for the palladium-catalyzed C–N bond coupling reactions. The structures of these new P,N-ligands were confirmed by 1H NMR, 13C NMR, 31P NMR, infrared, high resolution mass spectroscopy, and X-ray single crystal diffraction. The desired C–N bond coupling products were obtained in good to excellent yields (up to 95%) when the reactions of aryl bromides with secondary amines were performed under the optimized reaction conditions (Pd2(dba)3, 1 mol%; L5, 6 mol%; NaOtBu, 1.4 mmol; toluene, 2.5 ml; 100 oC).

Key words: P,N-ligand, palladium catalysis, C–N bond coupling, aryl bromide, secondary amine