Month: November 2022

In 2013,Nicolas, Lionel; Angibaud, Patrick; Stansfield, Ian; Meerpoel, Lieven; Reymond, Sebastien; Cossy, Janine published 《Copper-catalysed amidation of 2-chloro-pyridinesã€?RSC Advances published the findings.Recommanded Product: 53939-30-3 The information in the text is summarized as follows:

The simple and inexpensive N,N-dimethylcyclohexane-1,2-diamine/CuI catalytic system provides a versatile, easy and efficient access to an array of N-(2-pyridin-2-yl)-amides from 2-chloro-pyridine derivatives In the experimental materials used by the author, we found 5-Bromo-2-chloropyridine(cas: 53939-30-3Recommanded Product: 53939-30-3)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Recommanded Product: 53939-30-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Filali Baba, Yassir; Kandri Rodi, Youssef; Mague, Joel T.; Ouzidan, Younes; Ouazzani Chahdi, Fouad; Essassi, El Mokhtar published �Pyridin-2-yl)methyl 6-bromo-2-oxo-1-[(pyridin-2-yl)methyl]-1,2-dihydroquinoline-4-carboxylate�IUCrData published the findings.Quality Control of 2-(Bromomethyl)pyridine hydrobromide The information in the text is summarized as follows:

In the central dihydroquinoline unit of the title compound, C22H16BrN3O3, the dihydropyridinone and benzene rings are inclined to one another by 2.0 (1)°, while the outer pyridine rings are almost perpendicular to the plane of the dihydroquinoline ring system. The conformation of the mol. is partially determined by an intramol. C-H···O hydrogen bond. In the crystal, mols. stack along the b-axis direction through a combination of C-H···N and C-H···O hydrogen bonds and π-π stacking interactions involving the dihydroquinoline units, with a centroid-to-centroid distance of 3.7648 (15) Å. In the experimental materials used by the author, we found 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Quality Control of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Quality Control of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Nanjo, Takeshi; Kato, Natsuki; Takemoto, Yoshiji published 《Oxidative Decarboxylation Enables Chemoselective, Racemization-Free Esterification: Coupling of α-Ketoacids and Alcohols Mediated by Hypervalent Iodine(III)ã€?Organic Letters published the findings.Reference of 2-(2-Hydroxyethyl)pyridine The information in the text is summarized as follows:

An α-ketoacid could be converted into a reactive acylating agent by treatment with hypervalent iodine(III) species, and in so doing, a novel decarboxylative acylation of alcs. is discovered that affords a variety of esters in excellent yields. The esterification has been applied to a sterol bearing a free carboxylic acid and shows unique chemoselectivity. The procedure is racemization-free and operates under mild conditions.2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Reference of 2-(2-Hydroxyethyl)pyridine) was used in this study.

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cmâˆ?1 (ν19b mode) does not overlap with any of the other bands.Reference of 2-(2-Hydroxyethyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Dalton Transactions included an article by Zhu, Ling; Bai, Yue-Ling; Zhao, Yongmei; Xing, Feifei; Li, Ming-Xing; Zhu, Shourong. Recommanded Product: 1539-42-0. The article was titled 《Bis(2-pyridylmethyl)amine-functionalized alizarin: an efficient and simple colorimetric sensor for fluoride and a fluorescence turn-on sensor for Al3+ in an organic solutionã€? The information in the text is summarized as follows:

A complexone analog chemosensor, H2L, bearing chelating bis(2-pyridylmethyl) amine and alizarin groups was synthesized via the Mannich reaction. H2L chromically responds to OH-, F-, CH3COO-, and H2PO4- in DMF, CH3CN, and acetone, but not in CH3OH or H2O. The addition of F- ions to H2L selectively induces a significant and visible color change in acetonitrile and shifts both methylene proton signals upfield. H2L also exhibits visible responses to Mg2+, Sr2+, Ba2+, Tb3+, Cu2+, Co2+, Ni2+, Zn2+, Mn2+, Cd2+, and Fe3+ in solution AlCl3 can form an Al : L = 2 : 3 complex that not only changes the color of the DMF solution, but also significantly increases its fluorescence intensity. The limit of fluorescence turn-on detection for AlCl3 in DMF is 2.7 × 10-8 M, which is an order higher than those of other anthraquinone sensors reported in the literature. NMR spectroscopy shows that hydroxyl is not deprotonated upon interacting with Al3+, but will be partially deprotonated in the presence of Zn2+. Contrary to the complexone, the H2L-Ce(III) complex does not react chromically to F-. However, the H2L-NiCl2 complex responds chromically to F-, with higher sensitivity (LOD = 1.3 × 10-6 M F- in acetonitrile) than free H2L. The spectral changes in the presence of F- are similar to that of OH-; however, the spectrum shifts slightly to a longer wavelength and is more sensitive to both H2L and the H2L-NiCl2 complex. Moreover, 4% or less H2O in the solvent essentially has no influence on the F- sensitivity; however, high water content significantly decreases the F- sensitivity. The spectral changes of the Zn2+, Cu2+, Fe3+, Ce3+, and Ni2+ complexes in the presence of different NaOH concentrations were also investigated. In the experimental materials used by the author, we found Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Recommanded Product: 1539-42-0)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Recommanded Product: 1539-42-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,ChemCatChem included an article by Chan, Vincent S.; Krabbe, Scott W.; Li, Changfeng; Sun, Lijie; Liu, Yue; Nett, Alex J.. Computed Properties of C5H3BrClN. The article was titled 《Identification of an Oxalamide Ligand for Copper-Catalyzed C-O Couplings from a Pharmaceutical Compound Libraryã€? The information in the text is summarized as follows:

The use of pharmaceutical compound library approach in combination with high throughput screening to identify N,N’-bis(thiophene-2-ylmethyl)oxalamide as a ligand that was generally effective for copper-catalyzed C-O cross-couplings to prepare both biarylethers as well as phenols under mild conditions. In the experiment, the researchers used many compounds, for example, 5-Bromo-2-chloropyridine(cas: 53939-30-3Computed Properties of C5H3BrClN)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Computed Properties of C5H3BrClN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Biochemistry included an article by McLeod, Matthew J.; Krismanich, Anthony P.; Assoud, Abdeljalil; Dmitrienko, Gary I.; Holyoak, Todd. Computed Properties of C6H5NO2. The article was titled 《Characterization of 3-[(Carboxymethyl)thio]picolinic Acid: A Novel Inhibitor of Phosphoenolpyruvate Carboxykinaseã€? The information in the text is summarized as follows:

Phosphoenolpyruvate carboxykinase (PEPCK) has traditionally been characterized for its role in the first committed step of gluconeogenesis. The current understanding of PEPCK’s metabolic role has recently expanded to include it serving as a general mediator of tricarboxylic acid cycle flux. Selective inhibition of PEPCK in vivo and in vitro has been achieved with 3-mercaptopicolinic acid (MPA) (Ki âˆ?8μM), whose mechanism of inhibition has been elucidated only recently. On the basis of crystallog. and mechanistic data of various inhibitors of PEPCK, MPA was used as the initial chem. scaffold to create a potentially more selective inhibitor, 3-[(carboxymethyl)thio]picolinic acid (CMP), which has been characterized both structurally and kinetically here. These data demonstrate that CMP acts as a competitive inhibitor at the OAA/PEP binding site, with its picolinic acid moiety coordinating directly with the M1 metal in the active site (Ki âˆ?29-55μM). The extended carboxy tail occupies a secondary binding cleft that was previously shown could be occupied by sulfoacetate (Ki âˆ?82μM) and for the first time demonstrates the simultaneous occupation of both OAA/PEP subsites by a single mol. structure. By occupying both the OAA/PEP binding subsites simultaneously, CMP and similar mols. can potentially be used as a starting point for the creation of addnl. selective inhibitors of PEPCK. The experimental part of the paper was very detailed, including the reaction process of Picolinic acid(cas: 98-98-6Computed Properties of C6H5NO2)

Picolinic acid(cas: 98-98-6) is used in the preparation of 2-Aminodihydro[1,3]thiazines as BACE 2 inhibitors and their preparation and use in the treatment of diabetes.Computed Properties of C6H5NO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Organic Letters included an article by Xie, Haisheng; Shao, Youxiang; Gui, Jiao; Lan, Jianyong; Liu, Zhipeng; Ke, Zhuofeng; Deng, Yuanfu; Jiang, Huanfeng; Zeng, Wei. SDS of cas: 3510-66-5. The article was titled 《Co(II)-Catalyzed Regioselective Pyridine C-H Coupling with Diazoacetatesã€? The information in the text is summarized as follows:

A Co(II)-catalyzed pyridyl C-H bond carbenoid insertion with α-diazoacetates has been realized. This transformation features a highly regioselective C-C bond formation at the C3-position of pyridines, providing an efficient access to diverse α-aryl-α-pyridylacetates. After reading the article, we found that the author used 2-Bromo-5-methylpyridine(cas: 3510-66-5SDS of cas: 3510-66-5)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. SDS of cas: 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Infrared Spectroscopic Detection of Biosignatures at Lake Tirez, Spain: Implications for Marsã€?was published in Astrobiology in 2020. These research results belong to Preston, Louisa J.; Barcenilla, Rebeca; Dartnell, Lewis R.; Kucukkilic-Stephens, Ezgi; Olsson-Francis, Karen. Computed Properties of C6H5NO2 The article mentions the following:

The detection of potential biosignatures with mineral matrixes is part of a multifaceted approach in the search for life on other planetary bodies. The 2020 ExoMars Rosalind Franklin rover includes within its payload three IR spectrometers in the form of ISEM (IR Spectrometer for ExoMars), MicrOmega, and Ma-MISS (Mars Multispectral Imager for Subsurface Studies). The use of this technique in the detection and characterization of biosignatures is of great value. Organic materials are often co-deposited in terrestrial evaporites and as such have been proposed as relevant analogs in the search for life on Mars. This study focuses on Ca-sulfates collected from the hypersaline Tirez Lake in Spain. Mid IR and visible near IR anal. of soils, salt crusts, and crystals with green and red layering indicative of microbial colonization of the samples was acquired from across the lake and identified the main mineral to be gypsum with inputs of carbonate and silica. Organic functional groups that could be attributed to amides and carboxylic acids were identified as well as chlorophyll; however, due to the strong mineralogical absorptions observed, these were hard to unambiguously discern. Taxonomical assignment demonstrated that the archaeal community within the samples was dominated by the halophilic extremophile Halobacteriaceae while the bacterial community was dominated by the class Nocardiaceae. The results of this research highlight that sulfates on Mars are a mixed blessing, acting as an effective host for organic matter preservation but also a material that masks the presence of organic functional groups when analyzed with spectroscopic tools similar to those due to fly on the 2020 ExoMars rover. A suite of complementary anal. techniques therefore should be used to support the spectral identification of any candidate extraterrestrial biosignatures. The experimental process involved the reaction of Picolinic acid(cas: 98-98-6Computed Properties of C6H5NO2)

Picolinic acid(cas: 98-98-6) is used in the preparation of 2-Aminodihydro[1,3]thiazines as BACE 2 inhibitors and their preparation and use in the treatment of diabetes.Computed Properties of C6H5NO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Addressing Multiple Ions Using Single Optical Probe: Multi-Color Response via Mutually Independent Sensing Pathwaysã€?was written by Dey, Nilanjan; Bhattacharjee, Subham; Bhattacharya, Santanu. Formula: C6H6BrN And the article was included in ChemistrySelect in 2020. The article conveys some information:

Multiresponsive smart optical probe based on p-phenylene vinylene backbone is designed for simultaneous sensing of multiple ions, such as Cu2+, Zn2+ and F- at pH 7.4. A rapid color change from colorless to deep yellow is observed upon addition of both Cu2+ and Zn2+ ion. However, under long UV lamp, the green-colored emission of the probe is specifically quenched in the presence of Cu2+, while Zn2+ induces change in the emission color from green to yellow. On the contrary, F-, unlike Cu2+ and Zn2+, does not render any change in visible color, however, an emission quenching, similar to that of Cu2+ addition, was noticed. The binding of metal ions to the central bipyridine core diminishes the ′conformational flexibilityâ€?and facilitates ′ligand to metal ionâ€?charge transfer. On the contrary, addition of fluoride triggers the cleavage of silyl ether groups and results in the photo-induced electron transfer from free hydroxyl groups to the core aromatic unit. Thus, we can detect as well as discriminate these three ions (Cu2+, Zn2+ and F-) simultaneously by comparing the resp. output signals. Further, a sustainable strategy has been developed for on-site detection of toxic ions using reusable, low-cost paper strips.2-Bromo-5-methylpyridine(cas: 3510-66-5Formula: C6H6BrN) was used in this study.

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Formula: C6H6BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Direct Suzuki-Miyaura Coupling with Naphthalene-1,8-diaminato (dan)-Substituted Organoboronsã€?was written by Yoshida, Hiroto; Seki, Michinari; Kamio, Shintaro; Tanaka, Hideya; Izumi, Yuki; Li, Jialun; Osaka, Itaru; Abe, Manabu; Andoh, Hiroki; Yajima, Tomoki; Tani, Tomohiro; Tsuchimoto, Teruhisa. Quality Control of 2-Bromo-5-methylpyridine And the article was included in ACS Catalysis in 2020. The article conveys some information:

The direct Suzuki-Miyaura coupling with “”protected”” R-B(dan) (dan = naphthalene-1,8-diaminato) (R = Ph, 4-MeOC6H4, 2-pyridyl) was demonstrated to smoothly occur without in situ deprotection of the B(dan) moiety. The use of KOt-Bu (Ba(OH)2 in some cases) as a base under anhydrous conditions is the key to the successful cross-coupling, where R-B(dan) is readily converted into a transmetalation-active borate-form, regardless of the well-accepted diminished boron-Lewis acidity. In addition to this study using 2-Bromo-5-methylpyridine, there are many other studies that have used 2-Bromo-5-methylpyridine(cas: 3510-66-5Quality Control of 2-Bromo-5-methylpyridine) was used in this study.

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Quality Control of 2-Bromo-5-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem