A simple chemosensor (1) has been designed and synthesized. The chemosensor selectively recognizes Hg2+ ions in THF–H2O (3 : 1, v/v) by showing a significant increase in emission and a bluish color of the solution under exposure to UV light. Change of the fluorophore unit in 1 leads to 2, which also shows selective sensing of Hg2+ under similar conditions. Furthermore, while the ensemble of 1 with Hg2+ selectively senses reduced glutathione (GSH) over cysteine and homocysteine, the ensemble of 2 with Hg2+ has been observed to be inefficient to distinguish glutathione from other biothiols. Thus probe 1 and inputs Hg2+ and GSH can be used to develop an INHIBIT logic gate.
An efficient modular synthesis of N(1)-substituted triamines containing different tether lengths between nitrogen centers was developed. A series of N(1)-(9-anthracenylmethyl)triamines were evaluated for biological activity in L1210 (murine leukemia), alpha-difluoromethylornithine (DFMO)-treated L1210, Chinese hamster ovary (CHO), and CHO-MG cell lines. All triamines 8 had increased potency in DFMO-treated
9-<i>N</i>-Alkylaminomethylanthracene probes for selective fluorescence sensing of pentafluorophenol
作者:Anup Pandith、Ashwani Kumar、Hong-Seok Kim
DOI:10.1039/c5ra15900h
日期:——
9-N-Alkylaminomethylanthracenes (1 and 2) were synthesised for halophenol sensing, and their selectivity and sensitivity towards pentafluorophenol (PFP) in ethanol were investigated.
Polyamine conjugates as selective NMDA inhibitors and anti-cancer drugs
申请人:Phanstiel Otto
公开号:US20070088081A1
公开(公告)日:2007-04-19
Polyamine compounds, method of synthesis and method of use for anti-cancer purposes, for enhancing the activity of existing anti-cancer drugs, as well as, for inhibiting N-Methyl-D-Aspartate (NMDA) receptors found in neurotransmission systems are provided. Certain polyamine motifs have been identified that can be attached to toxic agents to facilitate their access to cancer cells as well as polyamine compounds of surprising cytotoxicity with selectivity in killing cancer cells, and surprising utility in the treatment of Alzheimer's disease and brain stroke. It includes an illustrative conjugate system with examples of a triamine or a tetraamine appended to a cytotoxic agent. Included is a general strategy to enhance cell uptake by attaching a polyamine vectoring system with an example of a triamine vector attached to an existing anti-cancer drug to improve its chemotherapeutic potency. There is an illustration of tetraamine derivatives which have surprising enhanced selectivity in inhibiting N-methyl-D-aspartate (NMDA) receptors involved in neurotransmission. Several ligands can affect the activity of this receptor, which has been shown to initiate cell death under stroke conditions (lack of oxygen). Tetraamine derivatives which bind or inhibit the action of the NMDA receptor provide new therapy for NMDA-associated human diseases, such as Alzheimer's disease and stroke.
Ni···S linkages and CH···Ni anagostic bonds are detected. The 1H-NMR results evidently show the steric effect of the anthracenyl and dithiocarbamate moieties upon complexation. Importantly, phosphorus and protonmagneticresonance spectroscopies are tools to probe the facile transformation of the mixed-ligand complexes 3 into the congeners 1 in the solution. The absorption and emission spectral data describe
在二硫化碳存在下,相应的仲胺和镍盐之间的一锅法反应制备了一系列单核蒽基二硫代氨基甲酸镍(II)配合物。X 射线晶体学数据揭示了在存在和不存在氯和硫氰酸根辅助配体的情况下,二硫代氨基甲酸镍 (II) 配合物的方形平面结构存在显着差异。此外,还检测了固态配合物的各种分子间相互作用,如π-π堆积、Ni···S键和CH ···Ni同构键。1 _H-NMR结果明显显示了蒽基和二硫代氨基甲酸酯部分在络合时的空间效应。重要的是,磷和质子磁共振光谱是探测混合配体配合物3轻松转化为溶液中同系物1的工具。吸收和发射光谱数据描述了蒽环对配合物1和2的光物理的影响。