220040-48-2Relevant articles and documents
Monopicolinate cyclen and cyclam derivatives for stable copper(II) complexation
Lima, Luis M. P.,Esteban-Gomez, David,Delgado, Rita,Platas-Iglesias, Carlos,Tripier, Raphael
, p. 6916 - 6927 (2012)
The syntheses of a new 1,4,7,10-tetraazacyclododecane (cyclen) derivative bearing a picolinate pendant arm (HL1), and its 1,4,8,11- tetraazacyclotetradecane (cyclam) analogue HL2, were achieved by using two different selective-protection methods involving the preparation of cyclen-bisaminal or phosphoryl cyclam derivatives. The acid-base properties of both compounds were investigated as well as their coordination chemistry, especially with Cu2+, in aqueous solution and in solid state. The copper(II) complexes were synthesized, and the single crystal X-ray diffraction structures of compounds of formula [Cu(HL)](ClO4)2· H2O (L = L1 or L2), [CuL1](ClO4) and [CuL2] Cl·2H2O, were determined. These studies revealed that protonation of the complexes occurs on the carboxylate group of the picolinate moiety. Stability constants of the complexes were determined at 25.0 °C and ionic strength 0.10 M in KNO3 using potentiometric titrations. Both ligands form complexes with Cu2+ that are thermodynamically very stable. Additionally, both HL1 and HL2 exhibit an important selectivity for Cu2+ over Zn2+. The kinetic inertness in acidic medium of both complexes of Cu2+ was evaluated by spectrophotometry revealing that [CuL2]+ is much more inert than [CuL1]+. The determined half-life values also demonstrate the very high kinetic inertness of [CuL2]+ when compared to a list of copper(II) complexes of other macrocyclic ligands. The coordination geometry of the copper center in the complexes was established in aqueous solution from UV-visible and electron paramagnetic resonance (EPR) spectroscopy, showing that the solution structures of both complexes are in excellent agreement with those of crystallographic data. Cyclic voltammetry experiments point to a good stability of the complexes with respect to metal ion dissociation upon reduction of the metal ion to Cu+ at about neutral pH. Our results revealed that the cyclam-based ligand HL2 is a very attractive receptor for copper(II), presenting a fast complexation process, a high kinetic inertness, and important thermodynamic and electrochemical stability.
OXOPYRIDINE DERIVATIVES USEFUL AS AMINOCARBOXYMUCONATE SEMIALDEHYDE DECARBOXYLASE (ACMSD) INHIBITORS
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Page/Page column 63, (2018/07/29)
The present invention is related to a compound represented by the following structural formula: The present invention is also related a method of treating a subject with a disease which can be ameliorated by inhibition of aminocarboxymuconate semialdehyde decarboxylase (ACMSD).
SUBSTITUTED BICYCLIC AZA-HETEROCYCLES AND ANALOGUES AS SIRTUIN MODULATORS
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Paragraph 0720; 0721, (2017/04/04)
Provided herein are novel substituted bicyclic aza-heterocycle sirtuin-modulating compounds and methods of use thereof. The sirtuin-modulating compounds may be used for increasing the lifespan of a cell, and treating and/or preventing a wide variety of diseases and disorders including, for example, diseases or disorders related to aging or stress, diabetes, obesity, neurodegenerative diseases, cardiovascular disease, blood clotting disorders, inflammation, cancer, and/or flushing as well as diseases or disorders that would benefit from increased mitochondrial activity. Also provided are compositions comprising a sirtuin-modulating compound in combination with another therapeutic agent.