Coordination of ZnII, CdII, and HgII by 2-Pyridineformamide-3-piperidyl-thiosemicarbazone
摘要:
Sodium in dry methanol reduces 2-cyanopyridine in the presence of 3-piperidylthiosemicarbazide and produces 2-pyridineformamide-3-piperidylthiosemicarbazone, HAmpip. Complexes with zinc(II), cadmium(II), and mercury(II) have been prepared and characterized by elemental analyses and spectroscopic techniques. In addition, the crystal structures of [Zn(Ampip)(2)], [Zn(Ampip)(Oac)](2), [Cd(HAmpip)Cl-2].(CH3)(2)SO, [Cd(HAmpip)Br-2] (.) (CH3)(2)SO, [Cd(HAmpip)I-2].(CH3)(2)SO, [Cd(Ampip)(2)] and [Hg(HAmpip)Br-2].(CH3)(2)SO have been solved. Coordination of the anionic and neutral thiosemicarbazone ligand is via the pyridyl nitrogen, imine nitrogen and thiolato/thione sulfur atom, respectively. In [Zn(Ampip)(OAc)](2) one of the bridging acetato ligands has monodentate coordination and the other bridges in a bidentate manner. Cd-113 NMR studies were carried out on the [Cd(HAmpip)X-2] (X = Cl, Br or I) and [Cd(Ampip)(OAc)](2) complexes. The Cd-113 chemical shifts are affected by the halogen and range from 411 to 301 ppm, and the spectrum of [Cd(Ampip)(OAc)](2) shows two signals at 450 and 251 ppm. The Hg-199 NMR spectrum of [Hg(HAmpip)Cl-2] also is discussed.
In an effort to develop a more potent anticancer therapeutic agent, a series of 2-pyridineformamide thiosemi-carbazones (R = H, 4-CH3, 5-F, 6-CH3 and[GRAPHICS]) have been synthesized and evaluated for their anti-cancer activities against the cancer cells MCF-7 (breast cancer cell line), A-431 and A375 (epidermoid carcinoma cell line), and HeLa (cervical cancer cell line) using MTT assay. All these 2-pyridineformamide thiosemicarbazones exhibited anti-proliferative activities towards these cell lines. 5FAmPyrr possess most profound effects against MCF-7 cells with IC50 of 0.9 mu M. In flow cytometry using Propidium Iodide, 5FAmPyrr was found to induce cell death significantly in a dose dependent manner (100 nM-3 mu M) and inhibited colony formation of MCF-7 cells. This compound induced pro-apoptotic protein Box and inhibited anti apoptotic protein Bcl-2 as well as both c-Jun and Jun N-terminal kinase (abbreviated as JNK) in concentration dependent manner. Further pro-caspase 3 and PARP were inhibited by 5FAmPyrr at concentration of 3 mu M. The results suggest that 5FAmPyrr exhibit anticancer potency and induced cell death by inhibiting MAPK signaling and inducing intrinsic apoptotic pathway. All these indicate that 2-pyridineformamide thiosemicarbazones could be developed as future therapeutics agents to treat cancer.[GRAPHICS].
Iron(III), cobalt(II,III), copper(II) and zinc(II) complexes of 2-pyridineformamide 3-piperidylthiosemicarbazone
作者:Karen A. Ketcham、John K. Swearingen、Alfonso Castiñeiras、Isabel Garcia、Elena Bermejo、Douglas X. West
DOI:10.1016/s0277-5387(01)00941-x
日期:2001.12
with iron(III), cobalt(II,III) copper(II) and zinc(II) have been prepared and characterized by molar conductivities, magnetic susceptibilities and spectroscopic techniques. In addition, the crystal structures of HAmpip, [Fe(Ampip)2]ClO4, [Cu(HAmpip)Cl2]·CH3OH and [Zn(HAmpip)Br2]·C2H6SO have been determined. Coordination is via the pyridyl nitrogen, imine nitrogen and thiolato or thione sulfur when coordinating
Series of 2-pyridineformamide thiosemicarbazones were synthesized. Their preferential cytotoxicity in nutrient deprived medium (NDM) was evaluated using PANC-1 human pancreatic cancer cells by employing an antiausterity strategy. 2-Pyridineformamide thiosemicarbazones induced apoptosis and exhibited preferential cytotoxic activity toward PANC-1 cells in NDM, with potencies in the submicromolar range. These compounds are potential candidates for the development of therapeutics against pancreatic cancer. (C) 2013 Elsevier Ltd. All rights reserved.
Spectral studies and X-ray crystal structures of three nickel(II) complexes of 2-pyridineformamide 3-piperidylthiosemicarbazone
作者:Karen A Ketcham、Isabel Garcia、John K Swearingen、Ayman K El-Sawaf、Elena Bermejo、Alfonso Castiñeiras、Douglas X West
DOI:10.1016/s0277-5387(02)00853-7
日期:2002.4
Reduction of 2-cyanopyridine by sodium in dry methanol in the presence of 3-piperidylthiosemicarbazide produces 2-pyridineformamide 3-piperidylthiosemicarbazone, HAmpip. Complexes with nickel(II) have been prepared and characterized by magnetic susceptibility and spectroscopic techniques. The crystal structures of [Ni(Ampip)(2)], [Ni(Ampip)OAc], and [Ni(HAmpip)Cl]Cl have been solved. Coordination of the anionic and neutral ligand is via the pyridyl nitrogen, imine nitrogen, and thiolatothione sulfur. [Ni(Ampip)(2)] is an approximately octahedral NiN4S2 center with the tridentate ligands in a meridonal arrangement. [Ni(Ampip)OAc] is essentially planar except for the acetato ligand, which is > 80degrees out of the coordination plane, and the ionic [Ni(HAmpip)Cl]Cl involves the neutral thiosemicarbazone ligand. (C) 2002 Published by Elsevier Science Ltd.