Category: pyridine-derivatives

Harnying, Wacharee; Sudkaow, Panyapon; Biswas, Animesh; Berkessel, Albrecht published an article in 2021. The article was titled 《N-Heterocyclic Carbene/Carboxylic Acid Co-Catalysis Enables Oxidative Esterification of Demanding Aldehydes/Enals, at Low Catalyst Loading》, and you may find the article in Angewandte Chemie, International Edition.SDS of cas: 103-74-2 The information in the text is summarized as follows:

The discovery that simple carboxylic acids, such as benzoic acid, boost the activity of N-heterocyclic carbene (NHC) catalysts in the oxidative esterification of aldehydes RCHO (R = heptan-3-yl, Ph, 1-[4-(propan-2-yl)phenyl]propan-2-yl, 6-methylhept-5-en-2-yl, etc.) was reported. A simple and efficient protocol for the transformation of a wide range of sterically hindered α- and β-substituted aliphatic aldehydes/enals, catalyzed by a novel and readily accessible N-Mes-/N-2,4,6-trichlorophenyl 1,2,4-triazolium salt, and benzoic acid as co-catalyst, was developed. A whole series of α/β-substituted aliphatic aldehydes/enals hitherto not amenable to NHC-catalyzed esterification could be reacted at typical catalyst loadings of 0.02-1.0 mol%. For benzaldehyde, even 0.005 mol% of NHC catalyst proved sufficient: the lowest value ever achieved in NHC catalysis. Preliminary studies point to carboxylic acid-induced acceleration of acyl transfer from azolium enolate intermediates as the mechanistic basis of the observed effect.2-(2-Hydroxyethyl)pyridine(cas: 103-74-2SDS of cas: 103-74-2) was used in this study.

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) 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. SDS of cas: 103-74-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nakamura, Takashi; Yonemura, Sota; Akatsuka, Shunya; Nabeshima, Tatsuya published their research in Angewandte Chemie, International Edition in 2021. The article was titled 《Synthesis of Single Isomeric Complexes with Dissymmetric Structures Using Macrocyclic Homooligomers》.Application of 3510-66-5 The article contains the following contents:

Bottom-up chem. synthesis to construct intricate mols. is a profound challenge. An effective approach is to use organic ligands and metal ions, but the formation of a single product among other possible candidates proved difficult for dissym. structures. The authors now report the synthesis of single isomeric complexes with dissym. structures using the mismatch in the coordination valences of macrocyclic homooligomers and metal ions. Amide-cyclodextrin derivatives possessing multiple 2,2′-bipyridyl (bpy) groups forms mononuclear complexes whose specific three bpy groups are linked in the fac-Λ configuration. The intermol. coordination of the β-cyclodextrin metal complex produces a dissym. cyclodextrin trimer as a single isomer, whose initially equivalent 21 (7×3) bipyridylamide-pyranose units are placed in different environments. Also, the authors realize chiral recognition of amino acid anions using the distinctive amide groups arranged on the unsym. fixed scaffold. The results came from multiple reactions, including the reaction of 2-Bromo-5-methylpyridine(cas: 3510-66-5Application of 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. Application of 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Development and validation of a mass spectrometry binding assay for mGlu5 receptor》 was written by Ricart-Ortega, Maria; Berizzi, Alice E.; Catena, Juanlo; Malhaire, Fanny; Munoz, Lourdes; Serra, Carmen; Lebon, Guillaume; Goudet, Cyril; Llebaria, Amadeu. Name: 2,6-Dibromopyridine And the article was included in Analytical and Bioanalytical Chemistry in 2020. The article conveys some information:

Abstract: Mass spectrometry (MS) binding assays are a label-free alternative to radioligand or fluorescence binding assays, so the readout is based on direct mass spectrometric detection of the test ligand. The study presented here describes the development and validation of a highly sensitive, rapid, and robust MS binding assay for the quantification of the binding of the metabotropic glutamate 5 (mGlu5) neg. allosteric modulator (NAM), MPEP (2-methyl-6-phenylethynylpyridine) at the mGlu5 allosteric binding site. The LC-ESI-MS/MS (liquid chromatog.-electrospray ionization-tandem mass spectrometric) anal. method was established and validated with a deuterated analog of MPEP as an internal standard The developed MS binding assay described here allowed for the determination of MS binding affinity estimates that were in agreement with affinity estimates obtained from a tritiated MPEP radioligand saturation binding assay, indicating the suitability of this methodol. for determining affinity estimates for compounds that target mGlu5 allosteric binding sites. In the experimental materials used by the author, we found 2,6-Dibromopyridine(cas: 626-05-1Name: 2,6-Dibromopyridine)

2,6-Dibromopyridine(cas: 626-05-1) 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 cm− 1 (ν19b mode) does not overlap with any of the other bands.Name: 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Enantioselective C-H Lactonization of Unactivated Methylenes Directed by Carboxylic Acids》 was written by Cianfanelli, Marco; Olivo, Giorgio; Milan, Michela; Klein Gebbink, Robertus J. M.; Ribas, Xavi; Bietti, Massimo; Costas, Miquel. HPLC of Formula: 624-28-2 And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:

The formidable challenges of controlling site-selectivity, enantioselectivity, and product chemoselectivity make asym. C-H oxidation a generally unsolved problem for nonenzymic systems. Discrimination between the two enantiotopic C-H bonds of an unactivated methylenic group is particularly demanding and so far unprecedented, given the similarity between their environments and the facile overoxidn. of the initially formed hydroxylation product. Here we show that a Mn-catalyzed C-H oxidation directed by carboxylic acids can overcome these challenges to yield γ-lactones in high enantiomeric excess (up to 99%) using hydrogen peroxide as oxidant and a Bronsted acid additive under mild conditions and short reaction times. Coordination of the carboxylic acid group to the bulky Mn complex ensures the rigidity needed for high enantioselectivity and dictates the outstanding γ site-selectivity. When the substrate contains nonequivalent γ-methylenes, the site-selectivity for lactonization can be rationally predicted on the basis of simple C-H activation/deactivation effects exerted by proximal substituents. In addition, discrimination of diastereotopic C-H bonds can be modulated by catalyst design, with no erosion of enantiomeric excess. The potential of this reaction is illustrated in the concise synthesis of a tetrahydroxylated bicyclo[3.3.1]nonane enabled by two key, sequential γ-C-H lactonizations, with the latter that fixes the chirality of five stereogenic centers in one step with 96% ee. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2HPLC of Formula: 624-28-2)

2,5-Dibromopyridine(cas: 624-28-2) 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 cm− 1 (ν19b mode) does not overlap with any of the other bands.HPLC of Formula: 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Comparative biological evaluation and G-quadruplex interaction studies of two new families of organometallic gold(I) complexes featuring N-heterocyclic carbene and alkynyl ligands》 was written by Meier-Menches, Samuel M.; Aikman, Brech; Dollerer, Daniel; Klooster, Wim T.; Coles, Simon J.; Santi, Nicolo; Luk, Louis; Casini, Angela; Bonsignore, Riccardo. Recommanded Product: 2510-22-7 And the article was included in Journal of Inorganic Biochemistry in 2020. The article conveys some information:

Exptl. organometallic gold(I) compounds hold promise for anticancer therapy. This study reports the synthesis of two novel families of gold(I) complexes, including N1-substituted bis-N-heterocyclic carbene (NHC) complexes of general formula [Au(N1-TBM)2]BF4 (N1-TBM = N1-substituted 9-methyltheobromin-8-ylidene) and mixed gold(I) NHC-alkynyl complexes, [Au(N1-TBM)alkynyl]. The compounds were fully characterized for their structure and stability in aqueous environment and in the presence of N-acetyl cysteine by NMR spectroscopy. The structures of bis(1-ethyl-3,7,9-trimethylxanthin-8-ylidene)gold(I), (4-ethynylpyridine)(1,9-dimethyltheobromine-8-ylidene)gold(I) and of (2,8-Diethyl-10-(4-ethynylphenyl)-5,5-difluoro-1,3,7,9-tetramethyl-5H-4λ4,5λ4-dipyrrolo[1,2-c:2′,1′-f][1,3,2]diazaborinine)(1,3,7,9-tetramethylxanthin-8-ylidene)gold(I) were also confirmed by X-ray diffraction anal. The compounds were studied for their properties as DNA G-quadruplex (G4 s) stabilizers by fluorescence resonance energy transfer (FRET) DNA melting. Only the cationic [Au(N1-TBM)2]BF4 family showed moderate G4 stabilization properties with respect to the previously reported benchmark compound [Au(9-methylcaffein-8-ylidene)2]+ (AuTMX2). However, the compounds also showed marked selectivity for binding to G4 structures with respect to duplex DNA in competition experiments For selected complexes, the interactions with G4 s were also confirmed by CD (CD) studies. Furthermore, the gold(I) complexes were assessed for their antiproliferative effects in human cancer cells in vitro, displaying moderate activity. Of note, among the mixed gold(I) NHC-alkynyl compounds, one features a fluorescent boron-dipyrromethene (BODIPY) moiety which allowed determining its uptake into the cytoplasm of cancer cells by fluorescence microscopy. In the experimental materials used by the author, we found 4-Ethynylpyridine(cas: 2510-22-7Recommanded Product: 2510-22-7)

4-Ethynylpyridine(cas: 2510-22-7) 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. Recommanded Product: 2510-22-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Bispicolyamine-based supramolecular polymeric gels induced by distinct different driving forces with and without Zn2+》 was published in International Journal of Molecular Sciences in 2020. These research results belong to Park, Jaehyeon; Kim, Ka Young; Kang, Seok Gyu; Lee, Shim Sung; Lee, Ji Ha; Jung, Jong Hwa. Application In Synthesis of Bis(pyridin-2-ylmethyl)amine The article mentions the following:

Metal-coordination polymeric gels are interesting areas as organic/inorganic hybrid supramol. materials. The bispicolylamine (BPA) based gelator (1) showed excellent gelation with typical fibrillar morphol. in acetonitrile. Upon complexing 1 with Zn2+, complexes ([1 + Zn + ACN]2+ and [1 + zinc trifluoromethanesulfonate (ZnOTf)]+) with four coordination numbers were formed, which determine the gel structure significantly. A gel-sol transition was induced, driven by the ratio of the two metal complexes produced. Through NMR anal., the driving forces in the gel formation (i.e., hydrogen-bonding and π-π stacking) were observed in detail. In the absence and the presence of Zn2+, the intermol. hydrogen-bonds and π-π stacking were the primary driving forces in the gel formation, resp. In addition, the supramol. gels exhibited a monolayer lamellar structure irresp. of Zn2+. Conclusively, the gels’ elasticity and viscosity reduced in the presence of Zn2+. The experimental part of the paper was very detailed, including the reaction process of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Application In Synthesis of Bis(pyridin-2-ylmethyl)amine)

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. Application In Synthesis of Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Enantioconvergent Cu-Catalyzed Intramolecular C-C Coupling at Boron-Bound C(sp3) Atoms of α-Aminoalkylboronates Using a C1-Symmetrical 2,2′-Bipyridyl Ligand Attached to a Helically Chiral Macromolecular Scaffold》 was published in Journal of the American Chemical Society in 2020. These research results belong to Yoshinaga, Yukako; Yamamoto, Takeshi; Suginome, Michinori. Formula: C6H6BrN The article mentions the following:

Enantioconvergent intramol. coupling of α-(2-bromobenzoylamino)benzylboronic esters was achieved using a copper catalyst having helically chiral macromol. bipyridyl ligand, PQXbpy. Racemic α-(2-bromobenzoylamino)benzylboronic esters were converted into (R)-configured 3-arylisoindolinones with high enantiopurity using right-handed helical PQXbpy as a chiral ligand in a toluene/CHCl3 mixed solvent. When enantiopure (R)- and (S)-configured boronates were sep. reacted under the same reaction conditions, both afforded (R)-configured products through formal stereoinvertive and stereoretentive processes, resp. From these results, a mechanism involving deracemization of organocopper intermediates in the presence of PQXbpy is assumed. PQXbpy switched its helical sense to left-handed when a toluene/1,1,2-trichloroethane mixed solvent was used, resulting in the formation of the corresponding (S)-products from the racemic starting material. In the part of experimental materials, we found many familiar compounds, such as 2-Bromo-5-methylpyridine(cas: 3510-66-5Formula: C6H6BrN)

2-Bromo-5-methylpyridine(cas: 3510-66-5) 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.Formula: C6H6BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem