Tag: M.W=100-150

Moon, Yonghoon; Lee, Wooseok; Hong, Sungwoo published the artcile< Visible-Light-Enabled Ortho-Selective Aminopyridylation of Alkenes with N-Aminopyridinium Ylides>, Electric Literature of 93-60-7, the main research area is blue LED ortho selective aminopyridylation alkene aminopyridinium ylide.

By utilizing an underexplored reactivity mode of N-aminopyridinium ylides, we developed the visible-light-induced ortho-selective aminopyridylation of alkenes via radical-mediated 1,3-dipolar cycloaddition The photocatalyzed single-electron oxidation of N-aminopyridinium ylides generates the corresponding radical cations that enable previously inaccessible 1,3-cycloaddition with a broader range of alkene substrates. The resulting cycloaddition adducts rapidly undergo subsequent homolytic cleavage of the N-N bond, conferring a substantial thermodn. driving force to yield various β-aminoethylpyridines. Remarkably, amino and pyridyl groups can be installed into both activated and unactivated alkenes with modular control of ortho-selectivity and 1,2-syn-diastereoselectivity under metal-free and mild conditions. Combined exptl. and computational studies are conducted to clarify the detailed reaction mechanism and the origins of site selectivity and diastereoselectivity.

Journal of the American Chemical Society published new progress about 1,3-Dipolar cycloaddition catalysts. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Electric Literature of 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Akhlaghpasand, Mohammadhosein; Tizro, Mahdi; Raoofi, Amir; Meymand, Arman Zeinaddini; Farhadieh, Mohammaderfan; Khodagholi, Fariba; Khatmi, Aysan; Soltani, Reza; Hoseini, Yadolah; Jahanian, Ali; Boroujeni, Mahdi Eskandarian; Aliaghaei, Abbas published the artcile< Grafted human chorionic stem cells restore motor function and preclude cerebellar neurodegeneration in rat model of cerebellar ataxia>, Reference of 350-03-8, the main research area is cerebellar ataxia chorionic stem cell neurodegeneration; 3-acetylpyridine; Cerebellar ataxia; Chorionic stem cells; Neurodegeneration; Transplantation.

Abstract: Cerebellar ataxia (CA) is a form of ataxia that adversely affects the cerebellum. Cell replacement therapy (CRT) has been considered as a potential treatment for neurol. disorders. In this report, we investigated the neuro-restorative effects of human chorionic stem cells (HCSCs) transplantation on rat model of CA induced by 3-acetylpyridine (3-AP). In this regard, HCSCs were isolated and phenotypically determined Next, a single injection of 3-AP was administered for ataxia induction, and bilateral HCSCs implantation was conducted 3 days after 3-AP injection, followed by expression anal. of a number of apoptotic, autophagic and inflammatory genes as well as vascular endothelial growth factor (VEGF) level, along with assessment of cerebellar neurodegeneration, motor coordination and muscle activity. The findings revealed that grafting of HCSCs in 3-AP model of ataxia decreased the expression levels of several inflammatory, autophagic and apoptotic genes and provoked the up-regulation of VEGF in the cerebellar region, prevented the degeneration of Purkinje cells caused by 3-AP toxicity and ameliorated motor coordination and muscle function. In conclusion, these data indicate in vivo efficacy of HCSCs in the reestablishment of motor skills and reversal of CA.

Metabolic Brain Disease published new progress about Antigens, Thy-1 Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Reference of 350-03-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hebel, David; Rozen, Shlomo published the artcile< Utilizing acetyl hypofluorite for chlorination, bromination, and etherification of the pyridine system>, HPLC of Formula: 13472-84-9, the main research area is pyridine chlorination acetyl hypofluorite; etherification pyridine acetyl hypofluorite; bromination pyridine acetyl hypofluorite.

AcOF, which is easily made from F2, possesses a strong electrophilic fluorine. This electrophile is able to attach itself to the nitrogen atom of pyridine and activate the ring toward nucleophilic attacks. The ultimate elimination of HF results in an overall easy nucleophilic displacement of the hydrogen of the important 2-position. The nucleophiles used, originate from solvents such as CH2Cl2, CH2Br2, and various primary alcs. Thus, 2-halo- or 2-alkoxypyridines are formed. The reaction conditions (room temperature, very short reaction times, and good yields) transform the task of direct substitution of the pyridine ring from an extremely difficult to a very easy procedure.

Journal of Organic Chemistry published new progress about Bromination. 13472-84-9 belongs to class pyridine-derivatives, and the molecular formula is C6H6ClNO, HPLC of Formula: 13472-84-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Chun; Lu, Xunhua; Wang, Mengna; Zhang, Ling; Jiang, Jian; Yan, Shunfa; Yang, Yuanyong; Zhao, Yonglong; Zhang, Lin published the artcile< A simple and efficient asymmetric hydrogenation of heteroaromatic ketones with iridium catalyst composed of chiral diamines and achiral phosphines>, Application In Synthesis of 350-03-8, the main research area is heteroaromatic ketone iridium catalyst stereoselective enantioselective hydrogenation; heteroaryl alc preparation.

An efficient iridium catalyst composed of a simple and com. available o-methoxytriphenylphosphine and 9-Amino (9-deoxy) epi-cinchonine was applied to the asym. hydrogenation of heteroaromatic ketones. A range of simple heteroaromatic ketones were hydrogenated with good to excellent enantioselectivities and high activities. In particular, thiophene ketones and furyl ketones furnished 98.6% ee with up to 2.18 x 104(1/h) TOF. This catalytic system was of practical value.

Tetrahedron Letters published new progress about Enantioselective synthesis. 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Application In Synthesis of 350-03-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mangas-Sanchez, Juan; Sharma, Mahima; Cosgrove, Sebastian C.; Ramsden, Jeremy I.; Marshall, James R.; Thorpe, Thomas W.; Palmer, Ryan B.; Grogan, Gideon; Turner, Nicholas J. published the artcile< Asymmetric synthesis of primary amines catalyzed by thermotolerant fungal reductive aminases>, Category: pyridine-derivatives, the main research area is ketone ammonia fungal aminase catalyst enantioselective reductive amination; amine preparation.

The structural and biochem. characterization as well as synthetic applications of two RedAms from Neosartorya spp. was described. (NfRedAm and NfisRedAm) that displayed a distinctive activity amongst fungal RedAms, namely a superior ability to use ammonia as the amine partner. Using these enzymes, The synthesis of a broad range of primary amines, with conversions up to >97% and excellent enantiomeric excess was demonstrated . Temperature dependent studies showed that these homologues also possess greater thermal stability compared to other enzymes within this family. Their synthetic applicability was further demonstrated by the production of several primary and secondary amines with turnover numbers (TN) up to 14 000 as well as continous flow reactions, obtaining chiral amines such as (R)-2-aminohexane in space time yields up to 8.1 g L-1 h-1. The remarkable features of NfRedAm and NfisRedAm highlight their potential for wider synthetic application as well as expanding the biocatalytic toolbox available for chiral amine synthesis.

Chemical Science published new progress about Amines Role: BPN (Biosynthetic Preparation), RCT (Reactant), BIOL (Biological Study), PREP (Preparation), RACT (Reactant or Reagent). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Jing; Chen, Le; Liu, Ying; Olajide, Tosin Michael; Jiang, Yuanrong; Cao, Wenming published the artcile< Identification of key aroma-active compounds in beef tallow varieties using flash GC electronic nose and GC x GC-TOF/MS>, Reference of 93-60-7, the main research area is aroma active compound beef GC electronic nose.

To uncover the integral flavor characteristics and individual odor active compounds in tallow derived from different beef fats: inguinal (IF), omental (OF), and perirenal fats (PF), we used flash GC electronic nose (flash GC E-nose) to analyze and characterize the samples. GC x GC-TOF/MS identified and quantified 195 volatile compounds with significant differences amongst the three kinds of fats. There were 45 important odorants (ROAV > 0.1) containing 23 key odorants (ROAV > 1), of which 43, 34, 35 important odorants were found in IF, OF, and PF, resp. Our results showed that the key odorants overall probably contribute to a fatty and sweat acid smell in IF, a meaty and slightly sweet taste in OF, and sweetness and slightly meaty taste in PF. Elucidating the distribution of key odorants in beef tallow from different parts of animals could provide a scientific basis for formulating and selecting raw materials of high-quality beef tallow flavor products.

European Food Research and Technology published new progress about Acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Reference of 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhong, Rui; Wei, Zeyuan; Zhang, Wei; Liu, Shun; Liu, Qiang published the artcile< A Practical and Stereoselective In Situ NHC-Cobalt Catalytic System for Hydrogenation of Ketones and Aldehydes>, Name: 1-(Pyridin-3-yl)ethanone, the main research area is cobalt complex catalyst preparation; secondary alc primary preparation diastereoselective; ketone hydrogenation cobalt catalyst; aldehyde hydrogenation cobalt catalyst.

Herein, a practical in situ catalytic system generated by easily available pincer NHC precursors, CoCl2 and a base enabled efficient and high-yielding hydrogenation of a broad range of ketones and aldehydes (over 50 examples and a maximum turnover number [TON] of 2,610) to afford alcs. was reported. This was the first example of NHC-Co-catalyzed hydrogenation of C=O bonds using flexible pincer NHC ligands consisting of a N-H substructure. Diastereodivergent hydrogenation of substituted cyclohexanone derivatives was also realized by fine-tuning of the steric bulk of pincer NHC ligands. Addnl., a bis(NHCs)-Co complex was successfully isolated and fully characterized and it exhibited excellent catalytic activity that equals that of the in-situ-formed catalytic system.

Chem published new progress about Alcohols Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Name: 1-(Pyridin-3-yl)ethanone.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Elawa, Sherif; Mirdell, Robin; Tesselaar, Erik; Farnebo, Simon published the artcile< The microvascular response in the skin to topical application of methyl nicotinate: Effect of concentration and variation between skin sites>, HPLC of Formula: 93-60-7, the main research area is skin microvascular response methyl nicotinate.

Me nicotinate (MN) induces a local cutaneous erythema in the skin and may be used as a local provocation in the assessment of microcirculation and skin viability. The aims were to measure the effects of increasing doses of MN, to find the concentration that yields the most reproducible effect from day to day and between sites, and to study the variation between skin sites. Microvascular responses to topically applied MN at different concentrations were measured in 12 subjects on sep. days and on contralateral sides, using laser speckle contrast imaging (LSCI). MN effects were measured in four different body sites. At 20 mmol/L, the response to MN was most reproducible day-to-day and site-to-site, and resulted in a plateau response between 5 and 20 min after application. The skin region of the lower back had a lower perfusion value compared to the epigastric region (p = 0.007). When responses were compared to nearby, unprovoked areas, a significantly larger increase in perfusion was seen in the forearm, compared to all other anatomical sites (p < 0.03). A concentration of 20 mmol/L MN generated the most reproducible microvascular response in the skin. The response varies between different body sites. Microvascular Research published new progress about Anatomy (anatomical site). 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, HPLC of Formula: 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Graca, Catia A. L.; Mendes, Maria Anita; Teixeira, Antonio Carlos S. C.; Velosa, Adriana Correia de published the artcile< Anoxic degradation of chlorpyrifos by zerovalent monometallic and bimetallic particles in solution>, Safety of 6-Chloropyridin-2-ol, the main research area is chlorpyrifoszerovalent monometallic bimetallic particle anoxic degradation; Bimetallic particles; Chlorpyrifos; Reductive degradation; Zerovalent copper; Zerovalent metals.

The degradation of highly toxic and persistent chlorinated organic compounds by zerovalent metals (ZVMs) has received considerable attention for in situ groundwater remediation. Due to its abundance and low toxicity, iron has been mostly applied for such purposes, despite several limitations, such as rapid surface passivation and little efficacy towards certain contaminants. Given that, we evaluated monometallic zerovalent iron (ZVI), copper (ZVC) and zinc (ZVZ), and bimetallic copper-coated ZVI (ZVI/Cu) and ZVZ (ZVZ/Cu) for anoxic reductive degradation of chlorpyrifos (CP). Two approaches to enhance metal reactivity were investigated: the synthesis of bimetallic particles with copper and the comparison between micro and nanoparticles. All of the tested monometallic and bimetallic particles dechlorinated the target mol., although complete chlorine removal was not achieved by any metal during the 30-d treatment period. Coating the zerovalent monometallic particles with copper enhanced reactivity. Reactivity was ZVC > ZVZ > ZVI for monometallic particles and ZVZ/Cu > ZVI/Cu for bimetallic microparticles. The anal. of the degradation products indicated the presence of dechlorinated compounds as well as 3,5,6-trichloro-2-pyridinol, a hydrolysis product.

Chemosphere published new progress about Decomposition (anoxic). 73018-09-4 belongs to class pyridine-derivatives, and the molecular formula is C5H4ClNO, Safety of 6-Chloropyridin-2-ol.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Rocco, Dalila; Manfroni, Giacomo; Prescimone, Alessandro; Klein, Y. Maximilian; Gawryluk, Dariusz J.; Constable, Edwin C.; Housecroft, Catherine E. published the artcile< Single and double-stranded 1D-coordination polymers with 4'-(4-Alkyloxyphenyl)-3,2':6',3''-terpyridines and {Cu2(μ-OAc)4} or {Cu4(μ3-OH)2(μ-OAc)2(μ3-OAc)2(AcOκO)2} motifs>, COA of Formula: C7H7NO, the main research area is alkyloxyphenyl terpyridine copper acetate coordination polymer; 1D-coordination polymer; 3,2’:6’,3”-terpyridine; copper(II) acetate; multinuclear cluster.

Five coordination polymers formed from combinations of copper(II) acetate and 4′-(4-alkyloxyphenyl)-3,2′:6′,3”-terpyridines with methoxy (1), n-butoxy (2), n-pentyloxy (3) and n-heptyloxy (4) substituents are reported. Reaction of 1 with Cu(OAc)2·H2O leads to the 1D-polymer [Cu2(μ-OAc)4(1)]n in which {Cu2(μ-OAc)4} paddle-wheel units are connected by ligands 1, or [{Cu4(μ3-OH)2(μ-OAc)2(μ3-OAc)2(AcO-κO)2(1)2}·2MeOH]n in which centrosym. tetranuclear clusters link pairs of ligands 1 to give a double-stranded 1D-polymer. Layering solutions of Cu(OAc)2·H2O (in MeOH) over 2, 3 or 4 (in CHCl3) leads to the assembly of the 1D-polymers [2{Cu2(μ-OAc)4(2)}·1.25MeOH]n, [Cu2(μ-OAc)4(3)]n and [{Cu2(μ-OAc)4(4)}·0.2CHCl3]n. In all compounds, the 3,2′:6′,3”-tpy unit coordinates only through the outer pyridine rings, but the conformation of the 3,2′:6′,3”-tpy responds to changes in the length of the alkyloxy tails leading to changes in the conformation of the polymer backbone and in the packing of the chains in the crystal lattice in the chains featuring {Cu2(μ-OAc)4} paddle-wheel linkers.

Polymers (Basel, Switzerland) published new progress about Coordination polymers Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, COA of Formula: C7H7NO.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem