摘要:
Treatment of benzophenone imine with the stoichiometric amount of Pd(OAc)(2) in acetic acid at 60 degrees C produced the corresponding acetato-bridged five-membered ortho-cyclopalladated dimer [Pd{C6H4CPh = NH}(mu-OAc)](2) (1), which was isolated in pure form in a 79% yield. Reaction of 1 with an excess of LiCl in acetone gave rise to the corresponding chlorido-bridged cyclopalladated dimer [Pd{C6H4CPh = NH}(mu-Cl)](2) (2) in a 78% yield. Compounds 1-2 reacted with an excess of py-d(5) or the stoichiometric amount of PPh3 to give the mononuclear compounds trans-N,L-[Pd{C6H4CPh = NH}(X)(L)] [3 (X = OAc, L = py-d(5)); 4 (X = Cl, L = py-d(5)); 5 (X = OAc, L = PPh3) and 6 (X = Cl, L = PPh3)]. Compounds 2-3 were prepared in CDCl3/py-d(5) solution and were studied by H-1 NMR, but were not isolated. In contrast, compounds 5-6 were prepared in acetone and were isolated in pure form in 43 and 79% yields, respectively. Compounds 1, 2, 5 and 6 were characterized by elemental analyses, mass spectrometry, IR, NMR and electronic spectroscopy. Compounds 1, 2, 5 and 6 showed high antiproliferative activity against MDA-MB231 and MCF7 human breast cancer cell lines, especially, compounds 5-6. These two latter compounds presented greater antiproliferative activity than cisplatin and produced IC50 values in the range 1-5 mu M. The interaction of compounds 1, 2, 5 and 6 with DNA was also studied by the DNA electrophoretic migration, DNA-ethidium bromide fluorescence quenching and viscometry techniques. (C) 2012 Elsevier B.V. All rights reserved.