Pyridine-derivatives

Rani, Pooja; Husain, Ahmad; Bhasin, K. K.; Kumar, Girijesh published the artcile< Metal-Organic Framework-Based Selective Molecular Recognition of Organic Amines and Fixation of CO2 into Cyclic Carbonates>, Related Products of 3731-53-1, the main research area is zinc cadmium pyridinylnaphthalenecarboxamide oxybisbenzoate nitroisophthalate MOF preparation cycloaddition catalyst; thermal stability zinc cadmium pyridinylnaphthalenecarboxamide oxybisbenzoate nitroisophthalate; crystal structure zinc cadmium pyridinylnaphthalenecarboxamide oxybisbenzoate nitroisophthalate.

Synthesis and structural depiction of two new metal-organic frameworks (MOFs), namely, [{Zn(L)(oba)}·4H2O]α (Zn-MOF-1) and [{Cd1/2(L)1/2(nipa)1/2(H2O)1/2}·(DMF)1/2(H2O)]α (Cd-MOF-2) (where L = N2,N6-di(pyridin-4-yl)naphthalene-2,6-dicarboxamide, 4,4′-H2oba = 4,4′-oxybisbenzoic acid, and 5-H2nipa = 5-nitroisophthalic acid) are reported. Both Zn-MOF-1 and Cd-MOF-2 have been prepared by reacting ligand L and coligand 4,4′-H2oba or 5-H2nipa with the resp. dihydrates of Zn(OAc)2 and Cd(OAc)2 (OAc = acetate). Crystal structure X-ray anal. discloses that Zn-MOF-1 displays an overall 2D → 3D interpenetrated framework structure. The topol. anal. by ToposPro suggests a (4)-connected uninodal sql topol. with a point symbol of {44·62} having 2D + 2D parallel polycatenation. However, crystal packing of Cd-MOF-2 adapted a porous framework architecture and was topol. simplified as (3,4)-connected binodal 2D net. In addition, both Zn-MOF-1 and Cd-MOF-2 were proved to be multifunctional materials for the recognition of organic amines and in the fixation of CO2 to cyclic carbonates. Remarkably, Zn-MOF-1 and Cd-MOF-2 showed very good fluorescence stability in aqueous media and have shown 98 and 97% quenching efficiencies, resp., for 4-aminobenzoic acid (4-ABA), among all of the researched amines. The mechanistic study of organic amines recognition proposed that fluorescence quenching happened mainly through hydrogen-bonding and π-π stacking interactions. Addnl., cycloaddition of CO2 to epoxide in the presence of Zn-MOF-1 and Cd-MOF-2 afforded up to 96% of cyclic carbonate within 24 h. Both Zn-MOF-1 and Cd-MOF-2 exhibited recyclability for up to five cycles without noticing an appreciable loss in their sensing or catalytic efficiency.

Inorganic Chemistry published new progress about Amines Role: ANT (Analyte), PEP (Physical, Engineering or Chemical Process), ANST (Analytical Study), PROC (Process). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Related Products of 3731-53-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ding, Li; Pannecouque, Christophe; De Clercq, Erik; Zhuang, Chunlin; Chen, Fen-Er published the artcile< Improving Druggability of Novel Diarylpyrimidine NNRTIs by a Fragment-Based Replacement Strategy: From Biphenyl-DAPYs to Heteroaromatic-Biphenyl-DAPYs>, Name: 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine, the main research area is difluorobiphenyl diarylpyrimidine synthesis NNRTIs antiHIV solubility cytotoxicity.

A series of novel heteroaromatic-difluoro-biphenyl-diarylpyrimidines were designed as non-nucleoside anti-HIV inhibitors targeting reverse transcriptase by a fragment-based replacement strategy with the purpose of improving the druggability. Hopping five- or six-membered heterocycle groups on the biphenyl moiety as bioisosterism for intrinsically cyanophenyl gave 23 derivatives All of these compounds possessed excellent HIV-1 inhibitory activity in the nanomolar range. Among them, 12g (I) with a 4-pyridine group displayed excellent inhibitory activity toward WT and mutant HIV virus possessing significant selectivity. Moreover, this compound exhibited a decent improvement in druggability than etravirine and rilpivirine: (1) The hydrochloric acid salt of 12g (I) exhibited significantly improved water solubility in different pH conditions. (2) 12g (I) did not show apparent CYP enzymic inhibitory activity or acute toxicity. (3) Excellent oral bioavailability was also revealed (F = 126%, rats) in 12g. Collectively, these novel heteroaromatic-biphenyl-DAPYs represent promising drug candidates for HIV clin. therapy.

Journal of Medicinal Chemistry published new progress about Anti-HIV agents. 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Name: 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Howard, Philip H.; Muir, Derek C. G. published the artcile< Identifying New Persistent and Bioaccumulative Organics Among Chemicals in Commerce>, Recommanded Product: 2,3,4,6-Tetrachloropyridine, the main research area is identifying new persistent bioaccumulative organic chem.

This work identified com. chems. which may be persistent and bioaccumulative (P&B) and are not being considered in current Great Lakes, North American, and Arctic pollutant measurement programs. The authors combined the Canadian Domestic Substance List (DSL; a list of 3059 substances of unknown or variable composition complex reaction products and biol. materials) and the USEPA Toxic Substances Control Act Inventory Update Rule database for years 1986, 1990, 1994, 1998, 2002, and 2006, yielding a database of 22,263 com. chems. From that list, 610 chems. were identified by estimates from USEPA EPISuite software and using expert judgment. This work yielded some interesting, probable P&B chems. which should be considered for addnl. study. Recent studies, following initial reports and presentations on this work, confirmed the environmental presence of many of these chems.

Environmental Science & Technology published new progress about Alcohols, C32-36-branched Role: NUU (Other Use, Unclassified), POL (Pollutant), PRP (Properties), USES (Uses), OCCU (Occurrence). 14121-36-9 belongs to class pyridine-derivatives, and the molecular formula is C5HCl4N, Recommanded Product: 2,3,4,6-Tetrachloropyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Shichen; Feng, Lei; Ma, Chen published the artcile< Simple and green synthesis of benzimidazoles and pyrrolo[1,2-a]quinoxalines via Mamedov heterocycle rearrangement>, HPLC of Formula: 21901-29-1, the main research area is benzimidazole pyrroloquinoxaline preparation green chem Mamedov heterocycle rearrangement.

A method for the synthesis of coupling compounds of benzimidazoles and pyrrolo[1,2-a]quinoxalines via Mamedov Heterocycle Rearrangement is reported here. This method was conducted at room temperature and only solvent (HOAc) was required. A series of 4-(1H-benzo[d]imidazol-2-yl)pyrrolo[1,2-a]quinoxaline derivatives were obtained in moderate to good yields.

New Journal of Chemistry published new progress about Benzimidazoles Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, HPLC of Formula: 21901-29-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lu, Min; Zhang, Hongjun; Li, Derun; Childers, Matthew; Pu, Qinglin; Palte, Rachel L.; Gathiaka, Symon; Lyons, Thomas W.; Palani, Anandan; Fan, Peter W.; Spacciapoli, Peter; Miller, J. Richard; Cho, Hyelim; Cheng, Mangeng; Chakravarthy, Kalyan; O′Neil, Jennifer; Eangoor, Padmanabhan; Beard, Adam; Kim, Hai-Young; Sauri, Josep; Gunaydin, Hakan; Sloman, David L.; Siliphaivanh, Phieng; Cumming, Jared; Fischer, Christian published the artcile< Structure-Based Discovery of Proline-Derived Arginase Inhibitors with Improved Oral Bioavailability for Immuno-Oncology>, Quality Control of 53636-56-9, the main research area is proline arginase inhibitor oral bioavailability immuno oncol.

Recent data suggest that the inhibition of arginase (ARG) has therapeutic potential for the treatment of a number of indications ranging from pulmonary and vascular disease to cancer. Thus, high demand exists for selective small mol. ARG inhibitors with favorable druglike properties and good oral bioavailability. In light of the significant challenges associated with the unique physicochem. properties of previously disclosed ARG inhibitors, we use structure-based drug design combined with a focused optimization strategy to discover a class of boronic acids featuring a privileged proline scaffold with superior potency and oral bioavailability. These compounds, exemplified by inhibitors 4a, 18, and 27, demonstrated a favorable overall profile, and 4a was well tolerated following multiple days of dosing at concentrations that exceed those required for serum arginase inhibition and concomitant arginine elevation in a syngeneic mouse carcinoma model.

ACS Medicinal Chemistry Letters published new progress about Antitumor agents. 53636-56-9 belongs to class pyridine-derivatives, and the molecular formula is C7H6BrNO2, Quality Control of 53636-56-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Patel, Ashvani Kumar; Rathor, Shikha Singh; Samanta, Sampak published the artcile< Regioselective access to di- and trisubstituted pyridines via a metal-oxidant-solvent-free domino reaction involving 3-chloropropiophenones>, Safety of 1-(Pyridin-3-yl)ethanone, the main research area is heterocyclic pyridine preparation regioselective chemoselective green chem; chloropropiophenone ketone tandem reaction.

A remarkable metal-oxidant-solvent- and base-free domino route for regioselective access to a wide range of 2,4-di- and 2,3,4/6-trisubstituted pyridines, e.g., I including carbo- and heterocyclic fused pyridines is reported. This [3C + 2C + 1N] cyclization reaction occurs between 3-chloropropiophenones RC(O)(CH2)2Cl (R = Ph, 4-iodophenyl, 5-methylthiophen-2-yl, etc.) (3C units), enolizable acyclic/cyclic ketones, e.g., 1,2,3,4-tetrahydronaphthalen-1-one (2C sources) and NH4OAc as a robust N source under neat conditions under an open atm., producing new C=C and C=N-C bonds in highly chemo- and regioselective manners. Interestingly, this eco-friendly method has many pos. features: excellent functional group tolerance, broad substrate scope, good to excellent regioselectivities, promising yields, no-unwanted products, neutral reaction conditions and appropriateness for large-scale synthesis. Mechanism studies reveal that the in situ generated β-amino ketone from 3-chloropropiophenone and an ammonium salt undergoes C=N bond formation with a ketone followed by an intramol. cyclization process (C=C bond), which are the decisive steps for pyridine synthesis.

Organic & Biomolecular Chemistry published new progress about C-C bond formation (cn). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Safety of 1-(Pyridin-3-yl)ethanone.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Blank, Benjamin; DiTullio, Nicholas W.; Miao, Clara K.; Owings, Franklin F.; Gleason, John G.; Ross, Stephen T.; Berkoff, Charles E.; Saunders, Harry L.; Delarge, J.; Lapiere, C. L. published the artcile< Mercaptopyridinecarboxylic acids. Synthesis and hypoglycemic activity>, Application In Synthesis of 53636-56-9, the main research area is hypoglycemia mercaptopyridinecarboxylic acid; picolinic nicotinic mercapto hypoglycemic; gluconeogenesis mercaptopyridinecarboxylate.

More than 50 title compounds, isomers, analogs, and derivatives were prepared and tested for hypoglycemic activity in 48 hr fasted rats. 3-Mercaptopicolinic acid (I) [14623-54-2], and its acetate (II) [39561-87-0] and methyl ester (III) [39561-86-9] gave significant hypoglycemia at a dose of 300 mg/kg, i.p., and were effective at lower doses or administered orally. P-methoxybenzyl mercaptan is described as a novel sulfurating agent to introduce a protected mercapto group. Structure-activity relations and the role of gluconeogenesis in the observed hypoglycemia were discussed.

Journal of Medicinal Chemistry published new progress about Gluconeogenesis. 53636-56-9 belongs to class pyridine-derivatives, and the molecular formula is C7H6BrNO2, Application In Synthesis of 53636-56-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zheng, Yan-Long; Newman, Stephen G. published the artcile< Methyl Esters as Cross-Coupling Electrophiles: Direct Synthesis of Amide Bonds>, Recommanded Product: Pyridin-4-ylmethanamine, the main research area is methyl ester amine nickel catalyzed cross coupling amide preparation.

Amide bond formation and transition metal-catalyzed cross-coupling are two of the most frequently used chem. reactions in organic synthesis. Recently, an overlap between these two reaction families was identified when Pd and Ni catalysts were demonstrated to cleave the strong C-O bond present in esters via oxidative addition When simple Me and Et esters are used, this transformation provides a powerful alternative to classical amide bond formations, which commonly feature stoichiometric activating agents. Thus far, few redox-active catalysts have been demonstrated to activate the C(acyl)-O bond of alkyl esters, which makes it difficult to perform informed screening when a challenging reaction needs optimization. We demonstrate that Ni catalysts bearing diverse NHC, phosphine, and nitrogen-containing ligands can all be used to activate Me esters and enable their use in direct amide bond formation.

ACS Catalysis published new progress about Aliphatic esters Role: RCT (Reactant), RACT (Reactant or Reagent). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Recommanded Product: Pyridin-4-ylmethanamine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hooda, Anjli; Nehra, Kapeesha; Dalal, Anuj; Bhagwan, Shri; Gupta, Isha; Singh, Devender; Kumar, Sumit published the artcile< Luminescent Features of Ternary Europium Complexes: Photophysical and Optoelectronic Evaluation>, Name: 2,2′-Bipyridine, the main research area is ternary europium complex luminescence photophys optoelectronics; Cyclovoltammograms; Europium complexes; Fluorinated β-diketone; Thermal analysis.

Trivalent europium complexes exhibit good luminescent characteristics. A series of octacoordinated ternary europium complexes with fluorinated diketone and heteroaromatic auxiliary unit were synthesized. The synthesized europium complexes were characterized by elemental, thermal, electrochem. and spectroscopic analyses. Band gap values lie in range of semiconductors which confirm the conducting behavior of prepared complexes. Photoluminescence spectra were recorded in solid state and DMSO solvent. Emission spectral profiles have displayed most intense peak at ∼ 612 nm corresponding to hypersensitive 5D0 → 7F2 transition. Colorimetric parameters suggest red luminous nature of europium complexes. The luminescent heteroleptic europium complexes might be utilized as emissive materials for fabricating display.

Journal of Fluorescence published new progress about Absorption spectra. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Name: 2,2′-Bipyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem