Bis(pyrimidine)-based palladium catalysts: synthesis, X-ray structure and applications in Heck-, Suzuki-, Sonogashira-Hagihara couplings and amination reactions

The synthesis of N,N-bis(pyrimid-2-yl)amine (1), N-acetyl-N,N-bis(pyrimid-2 -yl)amide (2), N-norborn-2-ene-5-ylbis(pyrimid-2-yl)carbamide (4) is descri bed. The Pd-complex N-acetyl-N,N-bis(pyrimid-2-yl)amine palladium dichlorid e (3) has been prepared from compound 2 and its X-ray structure has been de termined. A polymer supported catalytic system (6) was prepared via ring-op ening metathesis copolymerization of 4 with 1,4,4a,5,8,8a-hexahydro-1,4,5,8 -exo-endo-dimethanonaphthalene (HDMN-6) and subsequent loading with PdCl2. Both the homogeneous and heterogeneous catalysts 3 and 6 were active in Hec k-, Suzuki-, Sonogashira-Hagihara-type couplings and amination reactions us ing aryl iodides, bromides and chlorides. (C) 2001 Elsevier Science B.V. Al l rights reserved.