Pyridine-derivatives

Kucharska, E.; Hanuza, J.; Lorenc, J. published the artcile< Conformation of azo-bridge in 3,3'-dinitro-2,2'-azobipyridine and its 4,4'(or 5,5' or 6,6')-dimethyl-derivatives: Vibrational studies and DFT quantum chemical calculations>, Product Details of C6H5FN2O2, the main research area is conformation azo bridge dinitroazobipyridine dimethylderivative vibrational DFT quantum; Azopyridines; IR and Raman spectra; Methyl and nitro groups; Quantum chemical calculations; Vibrational characteristics of the azo-bond.

Syntheses of 3,3′-dinitro-2,2′-azobipyridine and 4,4′ (or 5,5′ or 6,6′)-dimethyl-3,3′-dinitro-2,2′-azobipyridine were described. Mol. structures of these compounds were determined and compared, to the basic compound, azobipyridine, reported by us earlier. The conformation of the azo-bond and other structural data are discussed in terms of substitution place of Me chromophore. FTIR and Raman spectra of these compounds were measured and analyzed. The 6-311G (2d,2p) basis set with the B3LYP functional were used to discuss the space conformation and dynamics of the studied compounds

Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy published new progress about Chromophores. 19346-45-3 belongs to class pyridine-derivatives, and the molecular formula is C6H5FN2O2, Product Details of C6H5FN2O2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Campos, Debora L.; Machado, Ignacio; Ribeiro, Camila M.; Gambino, Dinorah; Pavan, Fernando R. published the artcile< Bactericidal effect of pyridine-2-thiol 1-oxide sodium salt and its complex with iron against resistant clinical isolates of Mycobacterium tuberculosis>, Category: pyridine-derivatives, the main research area is Mycobacterium antibacterial pyridine thiol oxide sodium salt.

We determined the activity of pyridine-2-thiol 1-oxide sodium salt (Na mpo) and its complex with iron [Fe(mpo)3] against Mycobacterium tuberculosis. The compounds were tested against a standard strain of M. tuberculosis H37Rv (ATCC 27294), with minimal inhibitory concentrations (MIC90) of 7.20 and 1.07 μM to Na mpo and [Fe(mpo)3], resp., and against 3 clin. isolates with different genotypic profiles, with MIC values ranging 0.74-6.52 and 0.30-2.25 μM to Na mpo and [Fe(mpo)3], resp. [Fe(mpo)3] was more effective against susceptible strains but both compounds were effective in inhibiting MDR and XDR-TB clin. strains. The profile activity was determined through the methodol. of a time-kill curve against standard and clin. strains of M. tuberculosis. Time-kill studies indicated that Na mpo had an early bactericidal activity against H37Rv and clin. isolates, with sterilizing effects observed in 5 and 7 days, resp., at its MIC90. The anti MDR and XDR-M. tuberculosis activity and bactericidal effect of Na mpo and [Fe(mpo)3] demonstrate their potential as new compounds for the treatment of tuberculosis.

Journal of Antibiotics published new progress about Mycobacterium tuberculosis. 3811-73-2 belongs to class pyridine-derivatives, and the molecular formula is C5H4NNaOS, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Garrett, Mark D.; Scott, Robin; Sheldrake, Gary N.; Dalton, Howard; Goode, Paul published the artcile< Biotransformation of substituted pyridines with dioxygenase-containing microorganisms>, Product Details of C5H4ClNO, the main research area is toluene dioxygenase substituted pyridine oxidation.

A series of 2-, 3- and 4-substituted pyridines was metabolized using the mutant soil bacterium Pseudomonas putida UV4 which contains a toluene dioxygenase (TDO) enzyme. The regioselectivity of the biotransformation in each case was determined by the position of the substituent. 4-Alkylpyridines were hydroxylated exclusively on the ring to give the corresponding 4-substituted 3-hydroxypyridines, while 3-alkylpyridines were hydroxylated stereoselectively on C-1 of the alkyl group with no evidence of ring hydroxylation. 2-Alkylpyridines gave both ring and side-chain hydroxylation products. Chloro- and bromo-substituted pyridines, and pyridine itself, while being poor substrates for P. putida UV4, were converted to some extent to the corresponding 3-hydroxypyridines. These unoptimized biotransformations are rare examples of the direct enzyme-catalyzed oxidation of pyridine rings and provide a novel synthetic method for the preparation of substituted pyridinols. Evidence for the involvement of the same TDO enzyme in both ring and side-chain hydroxylation pathways was obtained using a recombinant strain of Escherichia coli (pKST11) containing a cloned gene for TDO. The observed stereoselectivity of the side-chain hydroxylation process in P. putida UV4 was complicated by the action of an alc. dehydrogenase enzyme in the organism which slowly leads to epimerization of the initial (R)-alc. bioproducts by dehydrogenation to the corresponding ketones followed by stereoselective reduction to the (S)-alcs.

Organic & Biomolecular Chemistry published new progress about Oxidation, regioselective. 96630-88-5 belongs to class pyridine-derivatives, and the molecular formula is C5H4ClNO, Product Details of C5H4ClNO.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gui, Jianzhou; Cong, Xiaohui; Liu, Dan; Zhang, Xiaotong; Hu, Zhide; Sun, Zhaolin published the artcile< Novel Bronsted acidic ionic liquid as efficient and reusable catalyst system for esterification>, Product Details of C9H13NO3S, the main research area is Bronsted acidic ionic liquid efficient reusable catalyst system esterification.

Under mild conditions and without any addnl. organic solvent, esterification of alcs. by carboxylic acids could be carried out in three new halogen-free Bronsted acidic ionic liquids, 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate, 1-(4-sulfonic acid) butylpyridinium hydrogen sulfate and N-(4-sulfonic acid)butyl triethylammonium hydrogen sulfate. Especially for esterification of ethanol by acetic acid, good conversion rate and high selectivity were obtained, and the liquid esters formed a sep. phase that was decanted. The ionic liquid could be reused after removal of water under vacuum.

Catalysis Communications published new progress about Bronsted acids Role: CAT (Catalyst Use), USES (Uses) (catalyst). 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Product Details of C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Rasina, Dace; Stakanovs, Georgijs; Kanepe-Lapsa, Iveta; Bobrovs, Raitis; Jaudzems, Kristaps; Jirgensons, Aigars published the artcile< Synthesis of 2-aminopyridopyrimidinones and their plasmepsin I, II, IV inhibition potency>, Reference of 870997-85-6, the main research area is aminopyridopyrimidinone preparation antimalarial SAR.

2-Aminoquinazolin-4(3H)-one-based inhibitors, 2-aminopyrido[2,3-d]-, -[3,2-d]-, and -[4,3-d]pyrimidin-4(3H)-ones beared subpocket-specific substituents at position 7 were prepared and tested for their Plm I, II, IV inhibition potency. The position of the nitrogen atom in 2-aminopyridopyrimidinones played significant role in the inhibitory potency against Plms. Pyrido[2,3-d]pyrimidin-4(3H)-one derivatives showed poor inhibitory potency against Plms I, II, IV irresp. of the substituent at position 7. However, pyrido[4,3-d]pyrimidin-4(3H)-ones and pyrido[3,2-d]pyrimidin-4(3H)-ones were more appropriate scaffolds for Plm inhibitor development. Particularly, 2-amino-7-[4-(3-phenylpropyl)phenyl]-3-[(tetrahydrofuran-2-yl)methyl]pyrido[3,2-d]pyrimidin-4(3H)-one showed very high potency against Plm IV subtype and high selectivity against human aspartic protease, cathepsin D.

Chemistry of Heterocyclic Compounds (New York, NY, United States) published new progress about Antimalarials. 870997-85-6 belongs to class pyridine-derivatives, and the molecular formula is C6H5BrN2O2, Reference of 870997-85-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Neranon, Kitjanit; Alberch, Laura; Ramstroem, Olof published the artcile< Design, Synthesis and Self-Assembly of Functional Amphiphilic Metallodendrimers>, HPLC of Formula: 366-18-7, the main research area is self assembly functional amphiphilic metallodendrimers decomplexation; amphiphiles; coordination; metallodendrimers; nanomaterials; self-assembly; supramolecular systems.

A new family of alkynylated, amphiphilic dendrimers consisting of amidoamine linkers connected to 5,5′-functionalized 2,2′-bipyridine cores has been developed and evaluated in the formation of metallodendrimers of different generations and in self-assembly protocols. A convergent synthetic strategy was applied to provide dumbbell-shaped amphiphilic dendrimers, where the 2,2′-bipyridine cores could be coordinated to FeII centers to afford corresponding metallodendrimers. The ability of the metallic- and non-metallic dendritic structures to self-assemble into functional supramol. aggregates were furthermore evaluated in aqueous solution Spherical aggregates with sizes of a few hundred nanometers were generally produced, where controlled disassembly of the metallodendrimers through decomplexation could be achieved.

ChemistryOpen published new progress about Alkynylation. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, HPLC of Formula: 366-18-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wandas, M.; Lorenc, J.; Kucharska, E.; Maczka, M.; Hanuza, J. published the artcile< Molecular structure and vibrational spectra of 3 (or 4 or 6)-methyl-5-nitro-2-pyridinethiones: FT-IR, FT-Raman and DFT quantum chemical calculations>, Synthetic Route of 22280-62-2, the main research area is structure vibrational spectra methylnitropyridinethione FT IR Raman DFT quantum.

IR and Raman spectra (RS) of polycrystalline 3-(or 4 or 6)-methyl-5-nitro-2-pyridinethione were measured and analyzed by d. functional theory (DFT) quantum chem. calculations The B3LYP/6-311G(2d,2p) approach was applied for both the thiol and thione tautomers due to the possibility of the formation of these two thiole forms. Mol. structures of these compounds were optimized starting from different mol. geometries of the thiol group and thione group. Two conformations of the 2-mercaptopyridine, trans and cis, were taken into account. The studied compounds appear in the solid state in the thione form. The effect of the hydrogen-bond formation in the studied compounds was considered.

Journal of Raman Spectroscopy published new progress about Conformation. 22280-62-2 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Synthetic Route of 22280-62-2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Liu, Jinguo; Yin, Feng; Hu, Jun; Ju, Yong published the artcile< Cu2+-triggered shrinkage of a natural betulin-derived supramolecular gel to fabricate moldable self-supporting gel>, Category: pyridine-derivatives, the main research area is copper ion shrinkage betulin supramol gel moldable self supporting.

Most supramol. gels have a poor ability to be molded into well-defined shapes, preventing them from having the same potential as clay-based and polymeric gels in applications. In this research, a natural betulin-derived bola-type amphiphile Py-BL was synthesized and found to assemble into a supramol. gel with left-handed helixes driven by hydrogen bonding and hydrophobic interactions. Due to the pyridine groups, which were able to coordinate metal ions and were sensitive to acidity, the resulting Py-BL gel exhibited responses to certain metal ions, and Cu2+-selective gel shrinkage was observed, with a contraction of the gel phase in three dimensions. The coordination between Cu2+ and pyridine groups in the ratio of 1 : 4 led to a cross-linked network of nanofibers and decreased the hydrophilic performance of the Py-BL gel, consequently causing the gelling solvent to extrude from the gel network with a macroscopic gel shrinkage. This Cu2+-triggered shrunken gel exhibited an improved rheol. strength and could self-demold spontaneously through the shrinkage process with a precise amount of Cu2+. Using this strategy, we fabricated moldable self-supporting supramol. gels with designed shapes and elec. conductivity It is believed that the Cu2+-triggered shrinkage provides a novel approach to the fabrication of moldable self-supporting supramol. gels at ultralow gel loadings.

Materials Chemistry Frontiers published new progress about Fluorescence. 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Karges, Johannes; Heinemann, Franz; Jakubaszek, Marta; Maschietto, Federica; Subecz, Chloe; Dotou, Mazzarine; Vinck, Robin; Blacque, Olivier; Tharaud, Mickael; Goud, Bruno; Vinuelas Zahinos, Emilio; Spingler, Bernhard; Ciofini, Ilaria; Gasser, Gilles published the artcile< Rationally Designed Long-Wavelength Absorbing Ru(II) Polypyridyl Complexes as Photosensitizers for Photodynamic Therapy>, HPLC of Formula: 366-18-7, the main research area is ruthenium polypyridyl complex preparation cancer PDT photosensitizer.

The utilization of photodynamic therapy (PDT) for the treatment of various types of cancer has gained increasing attention over the last decades. Despite the clin. success of approved photosensitizers (PSs), their application is sometimes limited due to poor water solubility, aggregation, photodegradation, and slow clearance from the body. To overcome these drawbacks, research efforts are devoted toward the development of metal complexes and especially Ru(II) polypyridine complexes based on their attractive photophys. and biol. properties. Despite the recent research developments, the vast majority of complexes utilize blue or UV-A light to obtain a PDT effect, limiting the penetration depth inside tissues and, therefore, the possibility to treat deep-seated or large tumors. To circumvent these drawbacks, we present the first example of a DFT guided search for efficient PDT PSs with a substantial spectral red shift toward the biol. spectral window. Thanks to this design, we have unveiled a Ru(II) polypyridine complex that causes phototoxicity in the very low micromolar to nanomolar range at clin. relevant 595 nm, in monolayer cells as well as in 3D multicellular tumor spheroids.

Journal of the American Chemical Society published new progress about Antitumor agents. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, HPLC of Formula: 366-18-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem