- Cyclams with Ambidentate Methylthiazolyl Pendants for Stable, Inert, and Selective Cu(II) Coordination
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Aiming to develop new copper chelates for application in nuclear medicine we report two new chelators, te1th and te2th, based on a cyclam backbone mono-N- or di-N1,N8-functionalized by methylthiazolyl arms. The acid-base properties of both ligands were investigated as well as their coordination chemistry, especially with Cu2+, when possible in aqueous solution and in the solid state. Single-crystal X-ray diffraction structures of complexes were determined. Stability constants of the copper(II) and zinc(II) complexes showed that the complexes of both ligands with Cu2+ are thermodynamically very stable, and they exhibit an important selectivity for Cu2+ over Zn2+. The kinetic inertness in acidic medium of both copper(II) complexes was evaluated revealing a quite good resistance to dissociation (the half-life times of complexes with te1th and te2th are 50.8 and 5.8 min, respectively, in 5 M HCl and 30 °C). The coordination geometry of the metal center in the complexes was established in aqueous solution based on UV-visible, electron paramagnetic resonance (EPR) spectroscopy, DFT studies, and NMR by using the zinc(II) complex analogues. The [Cu(te1th)]2+ and [Cu(te2th)]2+ complexes adopt trans-I and trans-III configurations both in the solid state and in solution, while the [Zn(te2th)]2+ complex crystallizes as the cis-V isomer but exists in solution as a mixture of trans-III and cis-V forms. Cyclic voltammetry experiments in acetonitrile point to a relatively easy reduction of [Cu(te2th)]2+ in acetonitrile solution (Epc = -0.41 V vs NHE), but the reduced complex does not undergo dissociation in the time scale of our electrochemical experiments. The results obtained in these studies revealed that despite the limited solubility of its copper(II) chelate, te2th is an attractive chelator for Cu2+ that provides a fast complexation process while forming a complex with a rather high thermodynamic stability and kinetic inertness with respect to dissociation even upon electrochemical reduction.
- Rodríguez-Rodríguez, Aurora,Halime, Zakaria,Lima, Luís M.P.,Beyler, Maryline,Deniaud, David,Le Poul, Nicolas,Delgado, Rita,Platas-Iglesias, Carlos,Patinec, Véronique,Tripier, Rapha?l
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- Improving the stability and inertness of Cu(ii) and Cu(i) complexes with methylthiazolyl ligands by tuning the macrocyclic structure
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A tacn based ligand bearing two methylthiazolyl arms (no2th) was synthesized with the aim to find ligands forming very stable and inert complexes with Cu(ii) and Cu(i) in aqueous medium for radiopharmaceutical applications. The no2th ligand was efficiently prepared following the orthoamide intermediate synthesis. The complexes with Cu2+ and Zn2+ were obtained and analyzed by X-ray diffraction. The [Cu(no2th)]2+ complex presents a pentacoordinated distorted square pyramidal coordination geometry, while the metal ion in [Zn(no2th)]2+ adopts a hexacoordinated distorted trigonal prismatic geometry involving the coordination of a perchlorate counter ion. The acid-base properties of no2th have been studied using potentiometric titrations, and the stability constants of Cu2+ and Zn2+ complexes were determined by potentiometric and UV-vis titrations using H4edta as a competitor ligand. The stability constant determined for the Cu2+ complex is rather high (log KCuL = 20.77 and pCu = 17.15), and moreover no2th exhibits a high selectivity for copper(ii) in relation to zinc(ii). The kinetics of the copper(ii) complexation process is very fast even in acidic medium. In addition, the [Cu(no2th)]2+ complex was found to be inert under rather harsh conditions (up to 2 M HCl and 60 °C), displaying a very high half-life time of about 15 days in 2 M HCl at 90 °C. The electrochemical reduction of the copper(ii) complex in water leads to the reversible formation of a stable copper(i) species. Spectroscopic studies performed by NMR, UV-vis and EPR, assisted by theoretical calculations, show that the [Cu(no2th)]2+ complex presents a structure in solution similar to that observed in the solid state. When compared to its cyclam di-N-methylthiazolyl counterpart, the results reported in this paper unambiguously show that replacing the cyclam unit by a tacn moiety improves the stability and inertness of its Cu(ii) and Cu(i) complexes.
- Le Fur, Mariane,Beyler, Maryline,Le Poul, Nicolas,Lima, Luís M. P.,Le Mest, Yves,Delgado, Rita,Platas-Iglesias, Carlos,Patinec, Véronique,Tripier, Rapha?l
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- Hetero-aromatic compound and its use in medicine
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The invention provides a hetero-aromatic compound or a stereisomer, geometric isomer, tautomer, despinner, nitrogen oxide, hydrate, solvate, metabolite, metabolism precursor and pharmaceutically acceptable salt or prodrug thereof, which is used for treating proliferative diseases. The invention also discloses a pharmaceutical composition containing the compound and an application of the compound or pharmaceutical composition thereof in preparation of a medicine for treating proliferative diseases.
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Paragraph 0883; 0898-0900
(2019/07/04)
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- THIOBENZOIMIDAZOLE AS FUNGICIDES
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The present invention relates to 2-thiobenzimidazoles of formula (I) which are of use as fungicides.
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Page/Page column 55
(2018/08/03)
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- COMPOUNDS THAT INHIBIT MCL-1 PROTEIN
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Provided herein are myeloid cell leukemia 1 protein (Mcl-1) inhibitors, methods of their preparation, related pharmaceutical compositions, and methods of using the same. For example, provided herein are compounds of Formula I, and pharmaceutically acceptable salts thereof and pharmaceutical compositions containing the compounds. The compounds and compositions provided herein may be used, for example, in the treatment of diseases or conditions, such as cancer.
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Page/Page column 1027; 1028
(2017/09/15)
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- TRIAZOLE-ISOXAZOLE COMPOUND AND MEDICAL USE THEREOF
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A compound represented by Formula [I]: or pharmaceutically acceptable salt thereof, wherein each symbol is as defined in the description.
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Paragraph 3410
(2016/06/06)
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- SUBSTITUTED PYRIDINE DERIVATIVES AS FABI INHIBITORS
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The present invention provides substituted pyridine derivatives of formula (I), which may be therapeutically useful as as anti-bacterial agents, more particulalrly FabI inhibitors. Formula(I) in which R1 to R5 and L have the meanings given in the specification, and pharmaceutically acceptable salts thereof that are useful in the treatment and prevention in diseases or disorder, in particular their use in diseases or disorder where there is an advantage anti-bacterial agents, more particularly FabI inhibitors. The present invention also provides methods for synthesizing and administering the FabI inhibitor compounds. The present invention also provides pharmaceutical formulations comprising at least one of the FabI inhibitor compounds together with a pharmaceutically acceptable carrier, diluent or excipient therefor.
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Page/Page column 38
(2013/06/27)
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- IMIDAZOPYRIMIDINONES AND USES THEREOF
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The present invention provides a compound of formula (I) or a pharmaceutically acceptable derivative, salt or prodrug thereof. The present invention further provides a method of treatment or prophylaxis of a viral infection in a subject comprising administering to said subject an effective amount of a compound of formula (I) or a pharmaceutically acceptable derivative, salt or prodrug thereof. Pharmaceutical compositions comprising a compound of formula (I) are also provided.
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Page/Page column 121
(2010/04/03)
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- SUBSTITUTED PYRAZOLE DERIVATIVES
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The present invention provides a novel pyrazole derivative and an androgen receptor antagonist containing the derivative. The present invention provides a compound represented by the formula (I′) wherein R1 is a hydrogen atom, a group via a carbon atom, a group via a nitrogen atom, a group via an oxygen atom, or a group via a sulfur atom; R2 is a phenyl group having cyano (the phenyl group may further have substituent(s) other than cyano); R3 is a hydrogen atom, a group via a carbon atom, a group via a nitrogen atom, a group via an oxygen atom, or a group via a sulfur atom; R4 is a cyclic group optionally having substituent(s); and X is methylene optionally having substituent(s), or CO, or a salt thereof.
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Page/Page column 37
(2009/10/31)
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- Conjugated compounds based on vinylthiazole units
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Conjugated compounds based on vinylthiazole units show a strong polarization along the π chain, when NR2 groups as electron donors are attached in the terminal position. The effect can be even more enhanced by a CHO group as electron acceptor in the opposite terminal position. This property makes such oligomers (n = 1, 2, . . .) interesting for applications in linear and nonlinear optics.
- Meier, Herbert,Nicklas, Frank,Petermann, Ralf
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experimental part
p. 1525 - 1529
(2008/10/09)
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- Thiazole-derived potent, highly bioavailable short duration growth hormone secretagogues
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Replacement of the phenyl in 3 with a 2-pyridyl or 4-thiazolyl group resulted in increased potency in the rat pituitary cell GH release assay and in beagles.
- Yang, Lihu,Morriello, Greg,Leung, Kwan,Jacks, Tom,Cheng, Kang,Schleim, Klaus D.,Smith, Roy,Patchett, Arthur A.
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p. 1761 - 1766
(2007/10/03)
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