Day: December 7, 2022

Costa, Marta published the artcileSelective synthesis of some imidazopyridine-fused chromones, Related Products of pyridine-derivatives, the publication is Tetrahedron (2011), 67(45), 8622-8627, database is CAplus.

A fused heterocyclic scaffold combining the imidazo[1,2-a]pyridine with a substituted chromone was synthesized in a one-pot procedure. The reaction proceeds by intramol. cyclization of 1-(2-imino-2H-chromen-3-yl)pyridinium chloride in ethanol and in the presence of DABCO. A detailed study of the exptl. conditions allowed a clear understanding of the reaction pathway.

Tetrahedron published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, Related Products of pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Singh, Anmol published the artcileComparative study of palladium(II) complexes bearing tridentate ONS and NNS Schiff base ligands: Synthesis, characterization, DFT calculation, DNA binding, bioactivities, catalytic activity, and molecular docking, Application In Synthesis of 91-02-1, the publication is Polyhedron (2022), 115895, database is CAplus.

Two palladium (II) Schiff base complexes were prepared by using equivalent molar of Schiff base ligand [L¹ = (E)-2-(((2-(benzylthio)phenyl)imino)methyl)naphthalen-1-ol and L² = (E)-N-(2-(benzylthio)phenyl)-1-phenyl-1-(pyridin-2-yl)methanimine] and sodium tetrachloropalladate. The structure of ligands and complexes were characterized by physicochem. and spectroscopic analyses. The results suggested that the Pd(II) complexes have a distorted square planar geometry when coordinated to the tridentate ONS from L¹ and the NNS donor ligand from L². Electronic absorption and spectrofluorometric measurements were employed to investigate the DNA binding of ligands and their associated complexes with CT-DNA. DFT calculations were used to optimize the geometric structures and calculate the electronic and structural properties of the synthesized compounds NBO anal. was also performed in combination with the TD-DFT method. Moreover, to study the reactivity and bioactivity, the synthesized compounds were tested for in-vitro antioxidant activity by utilizing the DPPH method, in-vitro anti-inflammatory activity using protein denaturation method, and in-vitro anti-diabetic activity employing α-glucosidase and α-amylase enzymes. The results reflect that PdL¹ is more biol. potent than PdL² or other related palladium complexes, as discussed in the literature. The binding mechanism of the synthesized compounds with CT-DNA, α-glucosidase, and α-amylase, was investigated using mol. docking experiments In addition to these, the catalytic activity of palladium metal complexes (PdL¹ and PdL²) was evaluated for the Suzuki-Miyaura reaction for comparisons.

Polyhedron published new progress about 91-02-1. 91-02-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene,Ketone, name is Phenyl(pyridin-2-yl)methanone, and the molecular formula is C13H16BF3O2S, Application In Synthesis of 91-02-1.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Muralirajan, Krishnamoorthy published the artcileCobalt-Catalyzed Mild Ring-Opening Addition of Arenes C-H Bond to 7-Oxabicyclic Alkenes, Quality Control of 85237-71-4, the publication is Advanced Synthesis & Catalysis (2017), 359(3), 513-518, database is CAplus.

A mild approach for a Cp*Co(III)-catalyzed C-H naphthylation of arenes by 7-oxabicyclic alkenes has been developed. In some cases, intermediate products with a 1,2-dihydronaphthalen-1-ol group have been isolated at room temperature in good yield. The catalytic reaction proceeds via C-H activation, insertion, β-oxygen elimination, protonation, and dehydration, resp. These simple protocols, featuring mild conditions and tolerance of functional groups, exhibit great potential for a variety of synthetic applications.

Advanced Synthesis & Catalysis published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, Quality Control of 85237-71-4.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Chang, Yu-Che published the artcileRe^I-Catalyzed highly regio- and stereoselective C-H addition to terminal and internal alkynes, Name: 5-Methyl-2-(p-tolyl)pyridine, the publication is Organic Chemistry Frontiers (2019), 6(4), 432-436, database is CAplus.

An effective ortho C-H functionalization of arylpyridines e.g., I and detachable N-pyrimidyl indoles II (R = H, CH₃, C(O)CH₃) by terminal and internal alkynes R¹CCR² (R¹ = H, C₆H₅, CH₃(CH₂)₂, C₆H₅CC; R² = 4-CH₃C₆H₄, (CH₂)₅OH, cyclohexyl, etc.) using a Re(I) catalyst providing an efficient access to various E-selective alkenylation products e.g., III were developed. The catalytic reaction is compatible with various aliphatic alkynes, aromatic terminal alkynes and internal alkynes, and structurally different nitrogen heterocycles. Deuterium-labeling experiments indicate that significant deuterium scrambling occurs with the directing groups and acetylenic sp C-H bonds before the migratory insertion.

Organic Chemistry Frontiers published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, Name: 5-Methyl-2-(p-tolyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Picconi, Pietro published the artcileNovel pyridyl nitrofuranyl isoxazolines show antibacterial activity against multiple drug resistant Staphylococcus species, Name: 2-Pyridinylboronic acid, the publication is Bioorganic & Medicinal Chemistry (2017), 25(15), 3971-3979, database is CAplus and MEDLINE.

A novel series of pyridyl nitrofuranyl isoxazolines were synthesized and evaluated for their antibacterial activity against multiple drug resistant (MDR) Staphylococcus strains. Compounds with piperazine linker between the pyridyl group and isoxazoline ring showed better activity when compared to compounds without the piperazine linker. 3-Pyridyl nitrofuranyl isoxazoline with a piperazine linker was found to be more active than corresponding 2-and 4-pyridyl analogs with MICs in the range of 4-32 μg/mL against MDR Staphylococcus strains. The eukaryotic toxicity of the compounds was tested by MTT assay and were found to be non-toxic against both non-tumor lung fibroblast WI-38 and cervical cancer cell line HeLa. The most active pyridyl nitrofuranyl isoxazoline compound showed improved activity against a panel of Staphylococcus strains compared to nitrofuran group containing antibiotic nitrofurantoin.

Bioorganic & Medicinal Chemistry published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C5H6BNO2, Name: 2-Pyridinylboronic acid.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Gutierrez-Bonet, Alvaro published the artcileAsymmetric Synthesis of Tertiary and Secondary Cyclopropyl Boronates via Cyclopropanation of Enantioenriched Alkenyl Boronic Esters, Computed Properties of 844501-00-4, the publication is Organic Letters (2022), 24(19), 3455-3460, database is CAplus and MEDLINE.

The cyclopropanation of alkenyl boronates and subsequent derivatization of the boronate handle are a convenient strategy to quickly build mol. complexity and access diverse compounds with a high sp³ fraction. Herein, the authors describe the asym. cyclopropanation of enantioenriched hydrobenzoin-derived alkenyl boronic esters toward the synthesis of tertiary and secondary cyclopropyl boronates.

Organic Letters published new progress about 844501-00-4. 844501-00-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester,Amide,Boronic Acids,Boronic acid and ester, name is (1-(tert-Butoxycarbonyl)-1,2,3,6-tetrahydropyridin-4-yl)boronic acid, and the molecular formula is C10H18BNO4, Computed Properties of 844501-00-4.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Stansfield, Ian published the artcileDevelopment of carboxylic acid replacements in indole-N-acetamide inhibitors of hepatitis C virus NS5B polymerase, Application In Synthesis of 197958-29-5, the publication is Bioorganic & Medicinal Chemistry Letters (2007), 17(18), 5143-5149, database is CAplus and MEDLINE.

Allosteric inhibition of the hepatitis C virus (HCV) NS5B RNA-dependent RNA polymerase enzyme has recently emerged as a viable strategy toward blocking replication of viral RNA in cell-based systems. We report here 2 series of indole-N-acetamides, bearing physicochem. diverse carboxylic acid replacements, which show potent affinity for the NS5B enzyme with reduced potential for formation of glucuronide conjugates. E.g., indole-N-acetamide I was prepared in several steps from Me 2-bromo-3-cyclohexyl-5-indolecarboxylate. Preliminary optimization of these series furnished compounds that are potent in the blockade of subgenomic HCV RNA replication in HUH-7 cells.

Bioorganic & Medicinal Chemistry Letters published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C6H4KNO6S, Application In Synthesis of 197958-29-5.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Pires, Marina J. D. published the artcileSynthesis of Substituted 4-, 5-, 6-, and 7-Azaindoles from Aminopyridines via a Cascade C-N Cross-Coupling/Heck Reaction, Name: 2-Bromopyridin-3-amine, the publication is Organic Letters (2016), 18(13), 3250-3253, database is CAplus and MEDLINE.

A practical palladium-catalyzed cascade C-N cross-coupling/Heck reaction of alkenyl bromides with amino-o-bromopyridines is described for a straightforward synthesis of substituted 4-, 5-, 6-, and 7-azaindoles using a Pd₂(dba)₃/XPhos/t-BuONa system. This procedure consists of the first cascade C-N cross-coupling/Heck approach toward all four azaindole isomers from available aminopyridines. The scope of the reaction was investigated and several alkenyl bromides were used, allowing access to different substituted azaindoles. This protocol was further explored for N-substituted amino-o-bromopyridines.

Organic Letters published new progress about 39856-58-1. 39856-58-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Bromide,Amine, name is 2-Bromopyridin-3-amine, and the molecular formula is C5H5BrN2, Name: 2-Bromopyridin-3-amine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Talik, Tadeusz published the artcileOn the reactions with nitrous acid of certain derivatives of 4-aminopyridine, substituted in position 2 or 2 and 6. III, Computed Properties of 18437-58-6, the publication is Roczniki Chemii (1959), 387-96, database is CAplus.

cf. C.A. 52, 5407b. It was established that 2-methyl-, 2,6-dimethyl-, and 2,6-dichloro-4-aminopyridine can be diazotized like aromatic compounds, in spite of the fact that the NH₂ group is bound in the position 4. The following products of reactions of the diazonium salts were prepared: 4-iodo-(m. 43°, yield 29.6%); 4-chloro-, (25.5%; picrate m. 203°); 4-bromo-, (37.7%, b. 180-1°; picrate m. 184°), and 4-cyano-2-methylpyridine (8.2%, b. 201° m. 45°; picrate m. 161°). 2-Methyl-4-pyridinocarboxylic acid (64.6%, m. 292°), 4-iodo-(19.6%, m. 99°; picrate m. 192°), 4-chloro-(21.5%; picrate m. 167°), 4-bromo-(42.6%, b. 194°; picrate m. 178°), 4-thiocyano-(17.85%, m. 63°; picrate m. 182°), and 4-cyano-2,6-dimethylpyridine (13.9%, m. 81°; picrate m. 174°). 2,6-Dimethyl-4-pyridinocarboxylic acid (m. 281°), 4-hydroxy-(65.4%, m. 196°), 4-iodo-(39.56%, m. 160°), 4-bromo-(35.84%, m. 95°), 4-cyano-2,6-dichloropyridine (m. 95°), and 2,4,6-trichloropyridine (30.1%, m. 32°). The substitution of diazonium by the CNS group was possible only in the case of diazonium salt of 2,6-dimethyl-4-aminopyridine.

Roczniki Chemii published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C17H20ClN3, Computed Properties of 18437-58-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

La Beaume, Paul published the artcileMicrowave-accelerated fluorodenitrations and nitrodehalogenations: expeditious routes to labeled PET ligands and fluoropharmaceuticals, COA of Formula: C6H3FN2, the publication is Tetrahedron Letters (2010), 51(14), 1906-1909, database is CAplus.

Methods for the expeditious fluorination of arenes have been investigated, using readily available fluoride sources. An optimized procedure for microwave-accelerated fluorodenitration has been developed, giving good to excellent yields in less than 10 min, rendering it practical for use in the preparation of F¹⁸ labeled ligands for PET imaging. Application of the method in the synthesis of CNS agents is demonstrated, and a practical method for the preparation of substrates is also presented.

Tetrahedron Letters published new progress about 847225-56-3. 847225-56-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Fluoride,Nitrile, name is 4-Fluoropicolinonitrile, and the molecular formula is C6H3FN2, COA of Formula: C6H3FN2.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem