Category: pyridine-derivatives

Lai, Ping-Shan; Jansen-van Vuuren, Ross D.; Lemieux, Robert P.; Snieckus, Victor published their research in Journal of Organic Chemistry in 2021. The article was titled 《Directed ortho and Remote Metalation-Suzuki-Miyaura Cross Coupling Route to Azafluorenol Core Liquid Crystals》.Application In Synthesis of 2,5-Dibromopyridine The article contains the following contents:

Two new smectic C* (SmC*) mesogens containing a hexyloxy side chain and an azafluorenone I or azafluorenol II core were synthesized using a combined directed ortho metalation-directed remote metalation-Suzuki-Miyaura cross-coupling strategy. The II was formed in 9 steps and 25% overall yield based on starting N,N-diethyl-3-methoxybenzamide. The I forms a nematic (N) phase while II forms a smectic A (SmA) phase. The large temperature range of the Sm phase for the azafluorenol II is indicative of mesophase stabilization by intermol. hydrogen bonding between the hydroxyl group and pyridine nitrogen. In the experimental materials used by the author, we found 2,5-Dibromopyridine(cas: 624-28-2Application In Synthesis of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine’s structure is isoelectronic with that of benzene, but its properties are quite different. Pyridine is completely miscible with water, whereas benzene is only slightly soluble. Like all hydrocarbons, benzene is neutral (in the acid–base sense), but because of its nitrogen atom, pyridine is a weak base.Application In Synthesis of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Nickel-Catalyzed Sonogashira C(sp)-C(sp2) Coupling through Visible-Light Sensitization》 was written by Zhu, Da-Liang; Xu, Ruijie; Wu, Qi; Li, Hai-Yan; Lang, Jian-Ping; Li, Hong-Xi. SDS of cas: 2510-22-7 And the article was included in Journal of Organic Chemistry in 2020. The article conveys some information:

An efficient method for visible-light-initiated, nickel-catalyzed Sonogashira C(sp)-C(sp2) coupling has been developed via an energy-transfer mode. Thioxanthen-9-one as a photosensitizer could significantly accelerate the arylation of alkynes with a wide range of (hetero)aryl halides in high yields. The cross-coupling reaction undergoes the stepwise oxidative addition of an arylhalide to nickel(0), transmetalation of the resulting aryl-Ni(II) halide species with Zn(II) acetylide into aryl-Ni(II) acetylide species, energy transfer from the excited state of thioxanthen-9-one to aryl-Ni(II) acetylide, and reductive elimination to the aryl alkyne. The experimental process involved the reaction of 4-Ethynylpyridine(cas: 2510-22-7SDS of cas: 2510-22-7)

4-Ethynylpyridine(cas: 2510-22-7) 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: 2510-22-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Discovery and Optimization of Non-bile Acid FXR Agonists as Preclinical Candidates for the Treatment of Nonalcoholic Steatohepatitis》 was written by Li, Junyou; Liu, Mengqi; Li, Yazhou; Sun, Dan-dan; Shu, Zhihao; Tan, Qian; Guo, Shimeng; Xie, Rongrong; Gao, Lixin; Ru, Hongbo; Zang, Yi; Liu, Hong; Li, Jia; Zhou, Yu. Product Details of 29682-15-3 And the article was included in Journal of Medicinal Chemistry in 2020. The article conveys some information:

Farnesoid X receptor (FXR) plays a key role in bile acid homeostasis, inflammation, fibrosis, and metabolism of lipid and glucose and becomes a promising therapeutic target for nonalcoholic steatohepatitis (NASH) or other FXR-dependent diseases. The phase III trial results of obeticholic acid demonstrate that the FXR agonists emerge as a promising intervention in patients with NASH and fibrosis, but this bile acid-derived FXR agonist brings severe pruritus and an elevated risk of cardiovascular disease for patients. Herein, we reported our efforts in the discovery of a series of non-bile acid FXR agonists, and 36 compounds were designed and synthesized based on the structure-based drug design and structural optimization strategies. Particularly, compound 42(I) is a highly potent and selective FXR agonist, along with good pharmacokinetic profiles, high liver distribution, and preferable in vivo efficacy, indicating that it is a potential candidate for the treatment of NASH or other FXR-dependent diseases. The results came from multiple reactions, including the reaction of Methyl 5-bromopicolinate(cas: 29682-15-3Product Details of 29682-15-3)

Methyl 5-bromopicolinate(cas: 29682-15-3) 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.Product Details of 29682-15-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Tryptophan metabolite concentrations in depressed patients before and after electroconvulsive therapy》 was published in Brain, Behavior, and Immunity in 2020. These research results belong to Ryan, Karen M.; Allers, Kelly A.; McLoughlin, Declan M.; Harkin, Andrew. Recommanded Product: Picolinic acid The article mentions the following:

Tryptophan and kynurenine pathway (KP) metabolites are implicated in the pathophysiol. of depression. We aimed to investigate their plasma concentrations in medicated patients with depression (n = 94) compared to age- and sex-matched healthy controls (n = 57), and in patients with depression after electroconvulsive therapy (ECT) in a real-world clin. setting, taking account of co-variables including ECT modality and heterogenous psychopathol. Depression severity was assessed using the Hamilton Depression Rating Scale (HAM-D24). Tryptophan (TRP) and kynurenine (KYN) metabolite concentrations [anthranilic acid (AA), 3-hydroxyanthranilic acid (3HAA), picolinic acid (PA), kynurenic acid (KYNA), and xanthurenic acid (XA)] and KYNA/KYN and KYNA/quinolinic acid (QUIN) ratios were lower in patients compared to controls. For the total group there was no significant change in KP metabolites post-ECT or correlations with mood ratings. However, improvements in mood score were correlated with increased KYN, 3-hydroxykynurenine (3HK), 3HAA, QUIN, and KYN/TRP in a subgroup of unipolar depressed patients. Addnl., in remitters baseline KYN, 3HK, and QUIN were associated with baseline HAM-D24 scores, and changes in 3HK and 3HAA concentrations post-ECT correlated with improvement in mood. KYN, KYNA, AA, 3HK, XA, PA, and QUIN were increased in a smaller 3-mo follow-up group (n = 19) compared to pre-ECT concentrations Overall, the results indicate that ECT mobilizes the KP, where a moderate association between selected metabolites and treatment response in unipolar depressed patients is evident. In the experiment, the researchers used Picolinic acid(cas: 98-98-6Recommanded Product: Picolinic acid)

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.Recommanded Product: Picolinic acid

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Asymmetric Synthesis of Multifunctionalized 2,3-Benzodiazepines by a One-pot N-Heterocyclic Carbene/Chiral Palladium Sequential Catalysis》 was published in Journal of Organic Chemistry in 2020. These research results belong to Ding, Ya-Li; Zhao, Yun-Long; Niu, Shuang-Shuo; Wu, Pei; Cheng, Ying. Computed Properties of C6H4BrNO The article mentions the following:

The first example of the construction of chiral 2,3-benzodiazepine compounds which are of biol. and pharmaceutical relevance by asym. catalysis is reported. Catalyzed by a thiazolium derived carbene and a palladium-chiral bidentate phosphine complex in sequence, one-pot reaction between 1-(2-(2-nitrovinyl)aryl)allyl esters with azodicarboxylates took place efficiently at ambient temperature to produce 4-nitro-1-vinyl-1H-2,3-benzodiazepine-2,3-dicarboxylates I (R = Me, Et, iPr; Z = C, N; X, Y = H, Me, Cl, etc.) in good to excellent yields with an enantiomeric ratio up to 95 : 5. In the part of experimental materials, we found many familiar compounds, such as 2-Bromonicotinaldehyde(cas: 128071-75-0Computed Properties of C6H4BrNO)

2-Bromonicotinaldehyde(cas: 128071-75-0) belongs to pyridine. Pyridine’s structure is isoelectronic with that of benzene, but its properties are quite different. Pyridine is completely miscible with water, whereas benzene is only slightly soluble. Like all hydrocarbons, benzene is neutral (in the acid–base sense), but because of its nitrogen atom, pyridine is a weak base.Computed Properties of C6H4BrNO

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Iridium(III)-Catalyzed Tandem Annulation of Pyridine-Substituted Anilines and α-Cl Ketones for Obtaining 2-Arylindoles》 was published in Journal of Organic Chemistry in 2020. These research results belong to Cui, Xin-Feng; Qiao, Xin; Wang, He-Song; Huang, Guo-Sheng. Recommanded Product: 3510-66-5 The article mentions the following:

A facile and expeditious protocol for the synthesis of 2-arylindole compounds from readily available N-(2-pyridyl)anilines and com. available α-Cl ketones through iridium-catalyzed C-H activation and cyclization is reported here. As a complementary approach to the conventional strategies for indole synthesis, the transformation exhibits powerful reactivity, tolerates a large number of functional groups, and proceeds with good to excellent yields under mild conditions, providing a straightforward method to obtain structurally diverse and valuable indole scaffolds. Furthermore, the reaction could be easily scaled up to gram scale. In the part of experimental materials, we found many familiar compounds, such as 2-Bromo-5-methylpyridine(cas: 3510-66-5Recommanded Product: 3510-66-5)

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.Recommanded Product: 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《In Situ Ring-Closing Strategy for Direct Synthesis of N-Heterocyclic Carbene Nickel Complexes and Their Application in Coupling of Allylic Alcohols with Aryl Boronic Acids》 was published in Advanced Synthesis & Catalysis in 2020. These research results belong to Wang, Yu-Bin; Liu, Bin-Yuan; Bu, Qingqing; Dai, Bin; Liu, Ning. Synthetic Route of C5H3Br2N The article mentions the following:

An in situ ring-closing strategy was developed for the synthesis of N-heterocyclic carbene nickel complexes, e.g., I. The process was carried out in air, and did not require solvent purification The resulting nickel complexes were investigated as catalysts for the coupling of allylic alcs. RCH=CHCH(OH)R1 (R = H, Me, phenyl; R1 = Me, Ph, thiophen-3-yl, etc.) with aryl boronic acids R2B(OH)2 (R2 = 4-methoxyphenyl, thiophen-3-yl, naphthalen-2-yl, etc.). A wide range of allylic substrates and aryl acids proved to be applicable to this catalytic system. Control experiments suggest that the Ni(0) may be the true active species in the coupling reactions. The results came from multiple reactions, including the reaction of 2,6-Dibromopyridine(cas: 626-05-1Synthetic Route of C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) 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.Synthetic Route of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Fragment-based discovery of a new class of inhibitors targeting mycobacterial tRNA modification》 was published in Nucleic Acids Research in 2020. These research results belong to Thomas, Sherine E.; Whitehouse, Andrew J.; Brown, Karen; Burbaud, Sophie; Belardinelli, Juan M.; Sangen, Jasper; Lahiri, Ramanuj; Libardo, Mark Daben J.; Gupta, Pooja; Malhotra, Sony; Boshoff, Helena I. M.; Jackson, Mary; Abell, Chris; Coyne, Anthony G.; Blundell, Tom L.; Floto, Rodrigo Andres; Mendes, Vitor. Formula: C6H7Br2N The article mentions the following:

Translational frameshift errors are often deleterious to the synthesis of functional proteins and could therefore be promoted therapeutically to kill bacteria. TrmD (tRNA-(N(1)G37) methyltransferase) is an essential tRNA modification enzyme in bacteria that prevents +1 errors in the reading frame during protein translation and represents an attractive potential target for the development of new antibiotics. Here, we describe the application of a structure-guided fragment-based drug discovery approach to the design of a new class of inhibitors against TrmD in Mycobacterium abscessus. Fragment library screening, followed by structure-guided chem. elaboration of hits, led to the rapid development of drug-like mols. with potent in vitro TrmD inhibitory activity. Several of these compounds exhibit activity against planktonic M. abscessus and M. tuberculosis as well as against intracellular M. abscessus and M. leprae, indicating their potential as the basis for a novel class of broad-spectrum mycobacterial drugs. In addition to this study using 2-(Bromomethyl)pyridine hydrobromide, there are many other studies that have used 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Formula: C6H7Br2N) was used in this study.

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridine is widely used in the precursor to agrochemicals and pharmaceuticals. Also, it is used as an important reagent and organic solvent.Formula: C6H7Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Synthesis of Functionalized Spirocyclic Indolines by Visible Light-Induced One-Pot Sequential Difluoromethylative Dearomatization, Hydroxylation, and Substitution Reactions》 were Wang, Qiang; Qu, Yi; Liu, Yuxiu; Song, Haibin; Wang, Qingmin. And the article was published in Advanced Synthesis & Catalysis in 2019. Name: fac-Tris(2-phenylpyridine)iridium The author mentioned the following in the article:

Herein an one-pot protocol for visible light-induced synthesis of functionalized spirocyclic indolines I [R = P(O)Ph2, 2-pyrrolyl, 3-indolyl, etc.; R1 = H, 5-F, 6-Me, etc.] was described under mild conditions by means of a process involving sequential difluoromethylative dearomatization, hydroxylation and substitution reactions of indole derivatives The transformation proceeded via a hydroxylated “”acetal pool”” intermediate that could react with various nucleophiles. Several of the phosphine-oxide and indole-substituted products showed good fungicidal activity, suggesting that this protocol might be useful in the agrochem. field. The results came from multiple reactions, including the reaction of fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6Name: fac-Tris(2-phenylpyridine)iridium)

fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6) 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. Name: fac-Tris(2-phenylpyridine)iridium

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Journal of Organic Chemistry included an article by Zhang, Yu-Fang; Duan, Wen-Di; Chen, Jingjing; Hu, Youhong. Safety of 4-Ethynylpyridine. The article was titled 《Base-Promoted Cascade Reactions of 3-(1-Alkynyl)chromones with Pyridinium Ylides to Chromeno[2,3-d]azepine Derivatives》. The information in the text is summarized as follows:

A base-promoted cascade reaction of 3-(1-alkynyl)chromones with pyridinium ylides has been developed to afford a novel chromeno[2,3-d]azepine scaffold in an efficient and economic manner. This tandem process involves multiple reactions including a Michael addition/deprotonation/alkyne-allene isomerization/cyclization and the subsequent 1,2-addition under mild conditions without a transition metal catalyst. In the part of experimental materials, we found many familiar compounds, such as 4-Ethynylpyridine(cas: 2510-22-7Safety of 4-Ethynylpyridine)

4-Ethynylpyridine(cas: 2510-22-7) 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. Safety of 4-Ethynylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem