Pyridine-derivatives

Reference of 2-Bromo-5-methylpyridineIn 2022 ,《Potassium tert-butoxide promoted regioselective deuteration of pyridines》 appeared in Chemical Communications (Cambridge, United Kingdom). The author of the article were Li, Yan; Zheng, Chenxu; Jiang, Zhi-Jiang; Tang, Jianbo; Tang, Bencan; Gao, Zhanghua. The article conveys some information:

A regioselective deuteration at the β- and γ-position of pyridines was reported. Efficient deuteration occurred with a combination of KOtBu and DMSO-d6, replenishing the prevailing α-deuteration of the pyridine systems. Preliminary mechanistic studies suggested that the dimsyl carbanion acts as one of the key intermediates. The experimental part of the paper was very detailed, including the reaction process of 2-Bromo-5-methylpyridine(cas: 3510-66-5Reference of 2-Bromo-5-methylpyridine)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Reference of 2-Bromo-5-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Safety of 2,5-DibromopyridineIn 2022 ,《Controlling the Complexity and Interconversion Mechanisms in Self-Assembled [Fe2L3]4+ Helicates and [Fe4L6]8+ Cages》 was published in Angewandte Chemie, International Edition. The article was written by Siddique, Rashid G.; Arachchige, Kasun S. A.; Al-Fayaad, Hydar A.; Thoburn, John D.; McMurtrie, John C.; Clegg, Jack K.. The article contains the following contents:

Self-assembled coordination cages and metal-organic frameworks have relied extensively on sym. ligands in their formation. Here the authors prepared a relatively simple system employing an unsym. ligand that results in two distinct self-assembled structures, a [Fe2L3]4+ helicate and a [Fe4L6]8+ cage composed of 10 interconverting diastereomers and their enantiomers. The steric profile of the ligand controls the complexity, thermodn. and kinetics of interconversion of the system. In the experiment, the researchers used 2,5-Dibromopyridine(cas: 624-28-2Safety of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine and pyridine-derived structures are privileged pharmacophores in medicinal chemistry and an essential functionality for organic chemists. As the prototypical π-deficient heterocycle, pyridine illustrates distinctive chemistry as both substrate and reagent. Safety of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application In Synthesis of Methyl 3-chloropicolinateOn June 1, 2015, Kozlov, Maxim V.; Kleymenova, Alla A.; Romanova, Lyudmila I.; Konduktorov, Konstantin A.; Kamarova, Kamila A.; Smirnova, Olga A.; Prassolov, Vladimir S.; Kochetkov, Sergey N. published an article in Bioorganic & Medicinal Chemistry Letters. The article was 《Pyridine hydroxamic acids are specific anti-HCV agents affecting HDAC6》. The article mentions the following:

Recently we reported benzohydroxamic acids (BHAs) as potent and selective inhibitors of hepatitis C virus (HCV) replicon propagation. In this work 12 pyridine hydroxamic acids (PHAs) e. g., I, were synthesized and tested in full-genome replicon assay. It was found that PHAs possessed very similar anti-HCV properties compared to BHAs. Both classes of hydroxamic acids caused hyperacetylation of α-tubulin pointing to inhibition of histone deacetylase 6 (HDAC6) as part of their antiviral activity. The tested compounds did not inhibit the growth of poliovirus, displaying high selectivity against HCV. After reading the article, we found that the author used Methyl 3-chloropicolinate(cas: 116383-98-3Application In Synthesis of Methyl 3-chloropicolinate)

Methyl 3-chloropicolinate(cas: 116383-98-3) belongs to pyridine. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. As ligands, solvents, and catalysts they facilitate reactions; thus descriptions of these new ligands and their applications abound each year.Application In Synthesis of Methyl 3-chloropicolinate

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Harper, Kaid C.; Vilardi, Sarah C.; Sigman, Matthew S. published an article on February 20 ,2013. The article was titled 《Prediction of Catalyst and Substrate Performance in the Enantioselective Propargylation of Aliphatic Ketones by a Multidimensional Model of Steric Effects》, and you may find the article in Journal of the American Chemical Society.Computed Properties of C7H11ClN2 The information in the text is summarized as follows:

The effectiveness of a new asym. catalytic methodol. is often weighed by the number of diverse substrates that undergo reaction with high enantioselectivity. Here we report a study that correlates substrate and ligand steric effects to enantioselectivity for the propargylation of aliphatic ketones. The math. model is shown to be highly predictive when applied to substrate/catalyst combinations outside the training set. After reading the article, we found that the author used (6-Methylpyridin-2-yl)methanamine hydrochloride(cas: 1365836-53-8Computed Properties of C7H11ClN2)

(6-Methylpyridin-2-yl)methanamine hydrochloride(cas: 1365836-53-8) belongs to anime. Reaction with nitrous acid (HNO2), which functions as an acylating agent that is a source of the nitrosyl group (―NO), converts aliphatic primary amines to nitrogen and mixtures of alkenes and alcohols corresponding to the alkyl group in a complex process. This reaction has been used for analytical determination of primary amino groups in a procedure known as the Van Slyke method.Computed Properties of C7H11ClN2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Severance, Rachel C.; Ellsworth, Joe; Smith, Mark D.; Kelley, Jennifer; Peterson, LeRoy Jr.; zur Loye, Hans-Conrad published their research in Journal of Chemical Crystallography on December 31 ,2010. The article was titled 《Synthesis and Crystal Structure of the Coordination Complex Cu(ppca’)2(H2O)2 (ppca’ = 3,4′-Bipyridine-6-Carboxylic Acid)》.Formula: C11H8N2O2 The article contains the following contents:

The coordination complex Cu(ppca’)2(H2O)2 (1) was synthesized hydrothermally using the ligand 3,4′-bipyridine-6-carboxylic acid (ppca’). Complex 1 consists of pseudo-octahedral copper(II) units hydrogen bonded into a three-dimensional network that crystallizes in the monoclinic P21/n space group. In complex 1, a 5.3429(4), b 29.343(2), c 6.7940(5) Å, and β 110.635(2)°. The experimental part of the paper was very detailed, including the reaction process of [3,4′-Bipyridine]-6-carboxylic acid(cas: 1214363-66-2Formula: C11H8N2O2)

[3,4′-Bipyridine]-6-carboxylic acid(cas: 1214363-66-2) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Formula: C11H8N2O2 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Bromination of methylpyridines in fuming sulfuric acid》 were Does, L. van der; Hertog, H. J.. And the article was published in Recueil des Travaux Chimiques des Pays-Bas in 1965. Safety of 2,3,5-Tribromo-4-methylpyridine The author mentioned the following in the article:

Methylpyridines heated and shaken with Br and H2SO4 produce a mixture of mono and polybromomethyl derivatives A tube was charged with 18.6 g. 2-picoline (I), 100 ml. fuming H2SO4 containing 65% SO3, and 12.8 Br and sealed. The contents were heated at 80° for 7 hrs. with shaking. On cooling 5-bromo-2-picoline (II) [m. 32-3°; HgCl2 adduct m. 189-91° (alc.)] sep. The residue [a mixture of II and 3-bromo-2-picoline (III)] is converted to 5-amino-2-picoline [m. 95-6° (petroleum ether)] and 3-amino-2-picoline in 84% yield. Bromination of 18.6 g. I at 130° gives 20 g. of a mixture of II and III and 3.6 g. of a residue which on steam distillation yields 0.8 g. 3,5,6-tribromo-2-picoline, m. 76-7° (alc.). No dibromopicolines were found. Bromination of 18.6 g. 3-picoline at 80° yields 5.2 g. 5-bromo-3-picoline (IV) (m. 16.5-7°), 2,4 g. 2-bromo-3-picoline, 0.4 g. 6-bromo-3-picoline, and 7.2 g. 2,5-dibromo-3-picoline (V) (m. 41-2°), separated by preparative gas liquid chromatography. IV us converted to 5-amino-3-picoline [m. 61-3° (petroleum ether); picrate m. 225° (decomposition)] in 90% yield. V is identified by comparing it with an authentic sample prepared from 2-amino-5-bromo-3-picoline [m. 90-2° (petroleum ether)] with 48% HBr in 70% yield. Bromination of 18.6 g. 4-picoline (VI) at 80° yields 17 g. 3-bromo-4-picoline (VII) [b9 74-5° nD 1.5610; HgCl2 adduct, m. 175-7° (alc.)], 3,5-dibromo-4-picoline (VIII) [m. 104-7°; HgCl2 adduct m. 219-21° (alc.)], and 0.03 g. 2,3,5-tribromo-4-picoline (IX) [m. 56-7° (aqueous alc.)]. No 2,5-dib0romo-4-picoline [m. 37-8° (alc.)] was found. Bromination of 0.15 mole VI at 90° gives 0.06 mole VIII and 0.03 mole IX. VII, heated with aqueous NH3 and CuSO4.5H2O in a sealed tube at 135° for 50 hrs., gives 3-amino-4-picoline (m. 106-7°; picrate m. 177-8°) in 85% yield. The structure of IX was proved by preparing it from 2-amino-3,5-dibromo-4-picoline [m. 123-4° (aqueous alc.)] with HBr. IX is converted to 3,5-dibromo-2-hydrazino-4-picoline (X) [m. 151-2° (alc.)] in 65-70% yield by heating with N2H4.H2O in 96° aqueous alc. at 130° for 5 hrs. in a sealed tube. X, when refluxed 4 hrs. with 10% aqueous CuSO4 solution, converts to VIII (30% yield), thus proving its structure. Bromination of 32.1 g. 2,6-lutidine (XI) at 55° for 5 hrs. produces 12 g. 3-bromo-2,6-lutidine [b14 82.5-3°, n2D0 1.5598; picrate m. 148-50° (alc.)] which can be converted to 3-amino-2,6-lutidine (m. 122°) to prove its structure. Bromination of 15.9 g. XI at 90° for 7 hrs. produces 32.8 g. crude 3,5-dibromo-2,6-lutidine (m. 46-57°) on steam distillation (m.p. of pure compound is 64°). Ionic mechanism for the bromination is postulated. The influence of Me groups in orientation is seen as less than that of the NH2 group. In the experiment, the researchers used many compounds, for example, 2,3,5-Tribromo-4-methylpyridine(cas: 3430-25-9Safety of 2,3,5-Tribromo-4-methylpyridine)

2,3,5-Tribromo-4-methylpyridine(cas: 3430-25-9) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Safety of 2,3,5-Tribromo-4-methylpyridine Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Double Deprotonation of Pyridinols Generates Potent Organic Electron-Donor Initiators for Haloarene-Arene Coupling》 were Barham, Joshua P.; Coulthard, Graeme; Kane, Ryan G.; Delgado, Nathan; John, Matthew P.; Murphy, John A.. And the article was published in Angewandte Chemie, International Edition in 2016. Reference of Methyl 5-methoxypicolinate The author mentioned the following in the article:

Transition metal-free couplings of haloarenes with arenes, triggered using alkali metal alkoxides in the presence of an organic additive, are receiving significant attention in the literature. Most of the known organic additives effect coupling of iodoarenes, but not bromoarenes, to arenes. Recently it was reported that 2-pyridinecarbinol (11) extends the reaction to aryl bromides. This paper studies the mechanism, and reports evidence for dianions derived from 11 as electron donors to initiate the reaction. It also proposes routes by which electron-poor benzoyl derivatives can be transformed into electron donors to initiate these reactions. In addition to this study using Methyl 5-methoxypicolinate, there are many other studies that have used Methyl 5-methoxypicolinate(cas: 29681-39-8Reference of Methyl 5-methoxypicolinate) was used in this study.

Methyl 5-methoxypicolinate(cas: 29681-39-8) belongs to pyridine. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. As ligands, solvents, and catalysts they facilitate reactions; thus descriptions of these new ligands and their applications abound each year.Reference of Methyl 5-methoxypicolinate

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Pyrimidines. XLIII. Ring transformations in reactions of heterocyclic compounds with nucleophiles. IX. Conversion of N-methylpyrimidinium salts to pyridines by carbanions》 were Oostveen, E. A.; Van der Plas, H. C.. And the article was published in Recueil des Travaux Chimiques des Pays-Bas in 1974. Reference of 2-Oxo-5-phenyl-1,2-dihydropyridine-3-carboxylic acid The author mentioned the following in the article:

On treatment with active methylene compounds in basic media the quaternary pyrimidinium salts were converted into pyridine derivatives. Thus, I(R = R1 = H; R = Ph, R1 = H, R = H, R1 = Ph) and CH2(CO2Et) with NaOH gave II. In the experiment, the researchers used many compounds, for example, 2-Oxo-5-phenyl-1,2-dihydropyridine-3-carboxylic acid(cas: 10177-08-9Reference of 2-Oxo-5-phenyl-1,2-dihydropyridine-3-carboxylic acid)

2-Oxo-5-phenyl-1,2-dihydropyridine-3-carboxylic acid(cas: 10177-08-9) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Reference of 2-Oxo-5-phenyl-1,2-dihydropyridine-3-carboxylic acid Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2017,Otero-Fraga, Jorge; Suarez-Pantiga, Samuel; Montesinos-Magraner, Marc; Rhein, Dennis; Mendoza, Abraham published 《Direct and Stereospecific [3+2] Synthesis of Pyrrolidines from Simple Unactivated Alkenes》.Angewandte Chemie, International Edition published the findings.Product Details of 31106-82-8 The information in the text is summarized as follows:

Pyrrolidines are important heterocyclic compounds with endless applications in organic synthesis, metal catalysis, and organocatalysis. Their potential as ligands for first-row transition-metal catalysts inspired a new method to access complex poly-heterocyclic pyrrolidines in one step from available materials. This fundamental step forward is based on the discovery of an essential organoaluminum promoter that engages unactivated and electron-rich olefins in intermol. [3+2] cycloadditions In the experimental materials used by the author, we found 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Product Details of 31106-82-8)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Product Details of 31106-82-8

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2017,Van Raden, Jeff M.; Louie, Shayan; Zakharov, Lev N.; Jasti, Ramesh published 《2,2′-Bipyridyl-Embedded Cycloparaphenylenes as a General Strategy To Investigate Nanohoop-Based Coordination Complexes》.Journal of the American Chemical Society published the findings.SDS of cas: 53939-30-3 The information in the text is summarized as follows:

Because of their unique cyclic architectures, tunable electronic properties, and supramol. chemistries, cycloparaphenylenes (CPPs) have the potential to act as a new class of ligands for coordination cages, metal-organic frameworks, and small-mol. transition-metal complexes. However, currently there is no general strategy to coordinate the cyclic framework to a variety of metal centers. The authors report here a general and scalable synthetic strategy to embed 2,2′-bipyridine units into the backbone of CPPs. The authors use this approach to synthesize a 2,2′-bipyridine-embedded [8]CPP (L), which the authors show can successfully coordinate to both Pd(II) and Ru(II) forming [PdLCl2], [PdL2](BF4)2 and [Ru(L)(bipy)2](PF6)2. The resulting coordination complexes, a Pd(II) nanohoop dimer and a bis(bipyridyl)ruthenium(II) functionalized nanohoop, show unique solid-state and photophys. properties. This work provides a proof of concept for a general strategy to use nanohoops and their derivatives as a new class of ligands. The experimental part of the paper was very detailed, including the reaction process of 5-Bromo-2-chloropyridine(cas: 53939-30-3SDS of 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. SDS of cas: 53939-30-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem