Excellent correlation between cathepsin B inhibition and cytotoxicity for a series of palladacycles
作者:John Spencer、Angela Casini、Olivier Zava、Rajendra P. Rathnam、Santosh K. Velhanda、Michel Pfeffer、Samantha K. Callear、Michael B. Hursthouse、Paul J. Dyson
DOI:10.1039/b912096c
日期:——
The reaction of the five- or six-membered C,N or C,S-palladacycles [(L)PdCl]2 with PTA (1,3,5-triaza-7-phosphaadamantane) led to the monomeric complexes [(L)Pd(PTA)Cl] 6a, 6b and 7 where LH= N,N-dimethyl-1-phenylmethanamine, benzyl(methyl)sulfane or 1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one respectively. Dimeric complexes have also been synthesised: [Pd2L2(μ-dppe)Cl2], where LH = 1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one (1a), (R)- or (S)-3-isopropyl-1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one (1b, 1c), [Pd2L2(μ-dppf)Cl2], where L= 1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one (4a) or (R)-3-isopropyl-1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one (4b), respectively, and dppe = 1,2-bis(diphenylphosphino)ethane, dppf = 1,1′-bis(diphenylphosphino)ferrocene. The complexes were characterised in solution, by 1H and 31P NMR spectroscopy, and single crystals of complexes 6b and 7 were studied in the solid state by X-ray crystallography. The palladacycles were evaluated for in vitro activity as cytotoxic agents on A2780/S cells and also as cathepsin B inhibitors, an enzyme implicated in a number of cancer related events.
五元或六元 C,N 或 C,S-palladacycles [(L)PdCl]2 与 PTA(1,3,5-三氮杂-7-磷杂金刚烷)反应生成单体复合物 [(L)Pd(PTA)Cl] 6a、6b 和 7、6b 和 7,其中 LH= N,N-二甲基-1-苯基甲胺、苄基(甲基)硫烷或 1-甲基-5-苯基-1H-苯并[e][1,4]二氮杂卓-2(3H)-酮。此外,还合成了二聚配合物:[Pd2L2(μ-dppe)Cl2],其中 LH = 1-甲基-5-苯基-1H-苯并[e][1,4]二氮杂卓-2(3H)-酮 (1a),(R)- 或 (S)-3- 异丙基-1-甲基-5-苯基-1H-苯并[e][1、4]二氮杂卓-2(3H)-酮(1b,1c),[Pd2L2(μ-dppf)Cl2],其中 L= 1-甲基-5-苯基-1H-苯并[e][1、4]二氮杂卓-2(3H)-酮 (4a) 或 (R)-3- 异丙基-1-甲基-5-苯基-1H-苯并[e][1,4]二氮杂卓-2(3H)-酮 (4b),dppe = 1,2-双(二苯基膦)乙烷,dppf = 1,1′-双(二苯基膦)二茂铁。通过 1H 和 31P NMR 光谱分析了这些复合物在溶液中的特性,并通过 X 射线晶体学研究了 6b 和 7 复合物在固态下的单晶体。研究人员评估了苍白双环作为 A2780/S 细胞的细胞毒剂以及作为 cathepsin B(一种与多种癌症相关事件有关的酶)抑制剂的体外活性。