Pyridine-derivatives

Al-Saif, Foziah A.’s team published research in Journal of Molecular Structure in 2020 | CAS: 98-98-6

Picolinic acid(cas: 98-98-6) is used as a chelate for alkaline earth metals. Used to prepare picolinato ligated transition metal complexes. In synthetic organic chemistry, has been used as a substrate in the Mitsunobu reaction and in the Hammick reaction.Reference of Picolinic acid

《Six new palladium(II) mixed ligand complexes of 2-, 3-, 4-monosubstituted derivative of pyridine ring with caffeine moiety: Synthesis, spectroscopic, morphological structures, thermal, antimicrobial and anticancer properties》 was written by Al-Saif, Foziah A.; Al-Humaidi, Jehan Y.; Binjawhar, Dalal N.; Refat, Moamen S.. Reference of Picolinic acid And the article was included in Journal of Molecular Structure in 2020. The article conveys some information:

In the present article, new complexes of mononuclear palladium, formed by the interaction of PdCl2 with nicotinamide (nta), picolinic acid (pia), and isonicotinic acid (ina) have been isolated in the solid state with 1:2 M ratio affords the new compounds [Pd(nta)2(Cl)2] (I), [Pd(pia)2] (II), and [Pd(ina)2] (III). The mixed ligand complexes with caffeine (caf) as a secondary ligand have been synthesized and formulated as [Pd(nta)(caf)(Cl)2] (IV), [Pd(pia)(caf)(Cl)] (V), and [Pd(ina)(caf)(Cl)] (VI) with ratio of metal: ligand: ligand is 1:1:1. Structures of these products has been established by elemental analyses, conductivity, FTIR, 1H NMR and thermal anal. data. The shifts of the ν(N-H) amino, ν(C=N1) pyridine, ν(C=O) carboxylic, and ν(C=N9) caffeine stretches have been monitored in order to find out the donor sites of the ligands. According to the exptl. data, the six complexes can be characterized in the solid state as mononuclear, with a four-coordinate stereochem. SEM, TEM, and XRD anal. determined the characteristics of synthesized nanoparticles. The in vitro antibacterial efficiency of the compounds were evaluated by paper disk diffusion method. Compounds were also screened for their anti-cancer activity against colorectal adenocarcinoma (Caco-2) and breast cancer (Mcf-7) cell lines. This study reveals that [Pd(pia)2] complex has a potent cytotoxic agent against human colorectal adenocarcinoma and breast cancer. The experimental process involved the reaction of Picolinic acid(cas: 98-98-6Reference of Picolinic acid)

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Simons, R. Thomas’s team published research in Journal of Organic Chemistry in 2020 | CAS: 53939-30-3

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. Application In Synthesis of 5-Bromo-2-chloropyridine

《Photochemically Mediated Nickel-Catalyzed Synthesis of N-(Hetero)aryl Sulfamides》 was written by Simons, R. Thomas; Scott, Georgia E.; Kanegusuku, Anastasia Gant; Roizen, Jennifer L.. Application In Synthesis of 5-Bromo-2-chloropyridine And the article was included in Journal of Organic Chemistry in 2020. The article conveys some information:

A general method for the N-arylation of sulfamides with aryl bromides is described. The protocol leverages a dual-catalytic system, with [Ir(ppy)2(dtbbpy)]PF6 as a photosensitizer, NiBr2•glyme as a precatalyst, and DBU as a base, and proceeds at room temperature under visible light irradiation Using these tactics, aryl boronic esters and aryl chlorides can be carried through the reaction untouched. The developed reactions efficiently engage simple bromoarenes and primary sulfamides in between 66% and quant. yields. For more challenging substrates, such as secondary sulfamides, reaction efficiency is documented. Thereby, these methods complement known Buchwald-Hartwig coupling methods for N-arylation of sulfamides. A general method for the N-arylation of sulfamides with aryl bromides is described. The protocol leverages a dual-catalytic system of Ni and a photoexcitable Ir complex and proceeds at room temperature under visible light irradiation Using these tactics, aryl boronic esters and aryl chlorides can be carried through the reaction untouched. Thereby, this method complements known Buchwald-Hartwig coupling methods for N-arylation of sulfamides. The experimental part of the paper was very detailed, including the reaction process of 5-Bromo-2-chloropyridine(cas: 53939-30-3Application In Synthesis of 5-Bromo-2-chloropyridine)

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bozejewicz, Daria’s team published research in Membranes (Basel, Switzerland) in 2021 | CAS: 141-86-6

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Reference of 2,6-Diaminopyridine

Bozejewicz, Daria; Osmialowski, Borys; Kaczorowska, Malgorzata Anna; Witt, Katarzyna published their research in Membranes (Basel, Switzerland) in 2021. The article was titled 《2,6-bis((benzoyl-R)amino)pyridine (R = H, 4-Me, and 4-NMe2) derivatives for the removal of Cu(II), Ni(II), Co(II), and Zn(II) ions from aqueous solutions in classic solvent extraction and a membrane extraction》.Reference of 2,6-Diaminopyridine The article contains the following contents:

In this paper, the application of new substituted 2,6-bis((benzoyl-R)amino)pyridine (R = H, 4-Me, and 4-NMe2) derivatives for the recovery of copper(II), nickel(II), cobalt(II), and zinc(II) ions from aqueous solutions was described. The structures of the synthesized compounds were confirmed by NMR spectroscopy (NMR), electrospray ionization high-resolution mass spectrometry (ESI HRMS), and tandem mass spectrometry methods (HCD MS/MS). Three different derivatives of 2,6-bis((benzoyl-R)amino)pyridine were used as carriers in membrane processes and as extractants in classic solvent extraction In each case, the single derivative recovery was carried out on a model solution that contained only one type of metal ions. Spectrophotometry studies were performed to determine the stability constants of the complexes formed by the synthesized species with analyzed metals ions. The results obtained indicate that the synthesized compounds form stable complexes with Cu(II), Ni(II), Co(II), and Zn(II) ions and can be used in both types of studied recovery processes. However, the effectiveness of the synthesized compounds in the recovery of metal ions depends both on the structure of compounds and properties of metals as well as on their concentration The results came from multiple reactions, including the reaction of 2,6-Diaminopyridine(cas: 141-86-6Reference of 2,6-Diaminopyridine)

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Georgiou, Charis’s team published research in Journal of Molecular Biology in 2017-08-04 | 212268-13-8

Journal of Molecular Biology published new progress about Cyclophilins Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (inhibitors). 212268-13-8 belongs to class pyridine-derivatives, and the molecular formula is C5H6FN3, Category: pyridine-derivatives.

Georgiou, Charis; McNae, Iain; Wear, Martin; Ioannidis, Harris; Michel, Julien; Walkinshaw, Malcolm published the artcile< Pushing the Limits of Detection of Weak Binding Using Fragment-Based Drug Discovery: Identification of New Cyclophilin Binders>, Category: pyridine-derivatives, the main research area is drug design diaminopyridine cyclophilin binding; PPIases; cyclophilin inhibitors; fragment-based drug discovery; free energy calculations; protein–ligand X-ray crystallography.

Fragment-based drug discovery is an increasingly popular method to identify novel small-mol. drug candidates. One of the limitations of the approach is the difficulty of accurately characterizing weak binding events. This work reports a combination of X-ray diffraction, surface plasmon resonance experiments and mol. dynamics simulations for the characterization of binders to different isoforms of the cyclophilin (Cyp) protein family. Although several Cyp inhibitors have been reported in the literature, it has proven challenging to achieve high binding selectivity for different isoforms of this protein family. The present studies have led to the identification of several structurally novel fragments that bind to diverse Cyp isoforms in distinct pockets with low millimolar dissociation constants A detailed comparison of the merits and drawbacks of the exptl. and computational techniques is presented, and emerging strategies for designing ligands with enhanced isoform specificity are described.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nie, Fang-Yuan’s team published research in Journal of Organic Chemistry in 2022-01-21 | 2127-03-9

Journal of Organic Chemistry published new progress about Aryl aldehydes, heteroaryl Role: RCT (Reactant), RACT (Reactant or Reagent). 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Recommanded Product: 1,2-Di(pyridin-2-yl)disulfane.

Nie, Fang-Yuan; Cai, Yi-Ping; Song, Qin-Hua published the artcile< Visible Light-Driven Decarboxylative Alkylation of Aldehydes via Electron Donor-Acceptor Complexes of Active Esters>, Recommanded Product: 1,2-Di(pyridin-2-yl)disulfane, the main research area is quinoline pyridine ketone preparation green chem; pyridinaldehyde quinolinaldehyde decarboxylative alkylation photochem.

In this paper, authors have developed photocatalyst-free and visible light-driven decarboxylative alkylation of pyridinaldehydes. The photochem. reactions are initiated via photoinduced single electron transfer from triethylamine to N-hydroxyphthalimide esters in electron donor-acceptor complexes. This photochem. method can achieve to translate 15 pyridinaldehydes and 11 2-quinolinaldehydes to the corresponding ketones. Furthermore, this strategy can also achieve two other transformations, disulfanes to aryl sulfides and a styrene sulfone to the alkyl-substituted alkene.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Sheehy, Kevin J’s team published research in European Journal of Organic Chemistry in 2020-06-01 | 93-60-7

European Journal of Organic Chemistry published new progress about Alkylation. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Recommanded Product: 3-(Methoxycarbonyl)pyridine.

Sheehy, Kevin J.; Bateman, Lorraine M.; Flosbach, Niko T.; Breugst, Martin; Byrne, Peter A. published the artcile< Identification of N- or O-Alkylation of Aromatic Nitrogen Heterocycles and N-Oxides Using 1H-15N HMBC NMR Spectroscopy>, Recommanded Product: 3-(Methoxycarbonyl)pyridine, the main research area is aromatic nitrogen heterocycle oxide alkylation HMBC NMR.

A series of representative diazines and pyridine N-oxides were subjected to alkylation using several different alkylating agents. The 15N NMR chem. shifts (δN values) of the diazines, pyridine N-oxides and derived alkylation products were determined using 1H-15N HMBC NMR spectroscopy at natural 15N abundance. The changes in the 15N NMR chem. shifts (Δ(δN) values) that occurred on going from starting materials to products in these reactions were analyzed. N-alkylation of diazines resulted in large upfield shifts of the δN values of the alkylated nitrogen (of the order of 100 ppm or greater). While O-alkylation of pyridine N-oxides resulted in upfield shifts of the δN values of the N-(alkoxy)pyridinium nitrogen, the Δ(δN) values were of a much smaller magnitude (ca. -42 ppm) than those observed for N-alkylations of diazines. Nitrogen NMR spectroscopic data from the literature of relevance to alkylation of azines, diazines, azine N-oxides and diazine N-oxides was gathered together, and using this in tandem with our 15N NMR spectroscopic data, we have been able to corroborate our observations on the trends observed in the Δ(δN) values associated with N- and O-alkylation reactions of aromatic N-heterocycles and N-oxides. An anal. protocol that relies on synergistic evaluation of 1H-15N HMBC and 1H-13C HMBC NMR spectra has been developed that enables unambiguous diagnosis of the occurrence of N-alkylation of aromatic N-heterocycles and O-alkylation of aromatic N-oxides.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nacsa, Eric D’s team published research in Journal of the American Chemical Society in 2018-03-07 | 876919-08-3

Journal of the American Chemical Society published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 876919-08-3 belongs to class pyridine-derivatives, and the molecular formula is C7H6FNO2, Formula: C7H6FNO2.

Nacsa, Eric D.; MacMillan, David W. C. published the artcile< Spin-Center Shift-Enabled Direct Enantioselective α-Benzylation of Aldehydes with Alcohols>, Formula: C7H6FNO2, the main research area is chiral aldehyde enantioselective preparation; aldehyde alc enantioselective benzylation photoredox organocatalyst photocatalyst.

Nature routinely engages alcs. as leaving groups, as DNA biosynthesis relies on the removal of water from ribonucleoside diphosphates by a radical-mediated “”spin-center shift”” (SCS) mechanism. Alcs., however, remain underused as alkylating agents in synthetic chem. due to their low reactivity in two-electron pathways. We report herein an enantioselective α-benzylation of aldehydes using alcs. as alkylating agents based on the mechanistic principle of spin-center shift. This strategy harnesses the dual activation modes of photoredox and organocatalysis, engaging the alc. by SCS and capturing the resulting benzylic radical with a catalytically generated enamine. Mechanistic studies provide evidence for SCS as a key elementary step, identify the origins of competing reactions, and enable improvements in chemoselectivity by rational photocatalyst design.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Liu, Mao-Chin’s team published research in Journal of Medicinal Chemistry in 1996-06-21 | 56622-54-9

Journal of Medicinal Chemistry published new progress about Antitumor agents. 56622-54-9 belongs to class pyridine-derivatives, and the molecular formula is C7H10N2, Computed Properties of 56622-54-9.

Liu, Mao-Chin; Lin, Tai-Shun; Cory, Joseph G.; Cory, Ann H.; Sartorelli, Alan C. published the artcile< Synthesis and Biological Activity of 3- and 5-Amino Derivatives of 2-Pyridinecarboxaldehyde Thiosemicarbazone>, Computed Properties of 56622-54-9, the main research area is Hydrazinecarbothioamide pyridinylmethylene preparation ribonucleoside diphosphate reductase; pyridinecarboxaldehyde thiosemicarbazone preparation ribonucleoside diphosphate reductase; CDP reductase pyridinecarboxaldehyde thiosemicarbazone preparation.

A series of 3- and 5-alkylamino derivatives, as well as other structurally modified analogs of 2-pyridinecarboxaldehyde thiosemicarbazone, were synthesized and evaluated as inhibitors of CDP reductase activity and for their cytotoxicity in vitro and antineoplastic activity in vivo against the L1210 leukemia. Examples of the target compounds were the pyridinecarboxaldehyde thiosemicarbazones I (R = alkyl, allyl). The most biol. active compounds were I (R = Me, Et, allyl), which were potent inhibitors of ribonucleotide reductase with corresponding IC50 values of 1.3, 1.0, and 1.4 μM. The latter compounds produced a significant prolongation of the survival time of L1210 leukemia-bearing mice, with corresponding optimum % T/C values of 223, 204, and 215 when administered twice daily for six consecutive days at dosages of 60, 80, and 80 mg/kg, resp.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Xiao-Gen’s team published research in Advanced Synthesis & Catalysis in 2022-02-15 | 93-60-7

Advanced Synthesis & Catalysis published new progress about Esters Role: RCT (Reactant), RACT (Reactant or Reagent). 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, COA of Formula: C7H7NO2.

Li, Xiao-Gen; Li, Fu; Xu, Yue; Xiao, Li-Jun; Xie, Jian-Hua; Zhou, Qi-Lin published the artcile< Hydrogenation of Esters by Manganese Catalysts>, COA of Formula: C7H7NO2, the main research area is primary alc preparation; ester hydrogenation manganese catalyst.

The hydrogenation of esters catalyzed by a manganese complex of phosphine-aminopyridine ligand was developed. Using this protocol, a variety of (hetero)aromatic and aliphatic carboxylates including biomass-derived esters and lactones were hydrogenated to primary alcs. R1CH2OH [R1 = Me, Ph, 2-furyl, etc.] with 63-98% yields. The manganese catalyst was found to be active for the hydrogenation of Me benzoate, providing benzyl alc. with turnover numbers (TON) as high as 45,000. Investigation of catalyst intermediates indicated that the amido manganese complex was the active catalyst species for the reaction.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ding, Weijie’s team published research in Organic Chemistry Frontiers in 2022 | 350-03-8

Organic Chemistry Frontiers published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Safety of 1-(Pyridin-3-yl)ethanone.

Ding, Weijie; Sheng, Jie; Li, Jin; Cheng, Xu published the artcile< Electroreductive 4-pyridylation of unsaturated compounds using gaseous ammonia as a hydrogen source>, Safety of 1-(Pyridin-3-yl)ethanone, the main research area is unsaturated compound cyanopyridine electrochem reductive pyridinylation; alkylpyridine preparation.

Electrochem. radical-cross-coupling with ammonia as a terminal reductant was reported in the reactions of α-Keto esters, β-keto esters, α,β-unsaturated esters, and α,β-unsaturated ketones with 4-CN pyridine. More than 50 corresponding pyridylation products were synthesized under constant current conditions using thiourea as an essential promoter to activate the intermediate derived from 4-CN pyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem