Day: October 21, 2022

Li, Lifan; Song, Xuyan; Qi, Mei-Fang; Sun, Bing published the artcile< Weak Bronsted base-promoted photoredox catalysis for C-H alkylation of heteroarenes mediated by triplet excited diaryl ketone>, SDS of cas: 93-60-7, the main research area is alkylated heteroarene regioselective preparation; heteroarene ether CH alkylation photoredox catalysis.

A weak Bronsted base-promoted photoredox catalysis had been developed for the direct C-H α-alkylation of heteroarenes with cyclic and acyclic ethers. The high efficiency of this strategy was demonstrated by the mild reaction conditions, broad substrate scope, economical reagents and high regioselectivity. With air as the sole oxidant, a set of alkylated heteroarenes were accessed smoothly. This strategy was also applied for late-stage functionalization of valuable vitamin E nicotinate and loratadine.

Tetrahedron Letters published new progress about Alkylation catalysts. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, SDS of cas: 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bregman, Howard; Chakka, Nagasree; Guzman-Perez, Angel; Gunaydin, Hakan; Gu, Yan; Huang, Xin; Berry, Virginia; Liu, Jingzhou; Teffera, Yohannes; Huang, Liyue; Egge, Bryan; Mullady, Erin L.; Schneider, Steve; Andrews, Paul S.; Mishra, Ankita; Newcomb, John; Serafino, Randy; Strathdee, Craig A.; Turci, Susan M.; Wilson, Cindy; DiMauro, Erin F. published the artcile< Discovery of Novel, Induced-Pocket Binding Oxazolidinones as Potent, Selective, and Orally Bioavailable Tankyrase Inhibitors>, Recommanded Product: Methyl 3-fluoroisonicotinate, the main research area is preparation SAR oxazolidinone orally bioavailable tankyrase inhibitor mol modeling.

Tankyrase (TNKS) is a poly-ADP-ribosylating protein (PARP) whose activity suppresses cellular axin protein levels and elevates β-catenin concentrations, resulting in increased oncogene expression. The inhibition of tankyrase (TNKS1 and 2) may reduce the levels of β-catenin-mediated transcription and inhibit tumorigenesis. Compound I is a previously described moderately potent tankyrase inhibitor that suffers from poor pharmacokinetic properties. Herein, we describe the utilization of structure-based design and mol. modeling toward novel, potent, and selective tankyrase inhibitors with improved pharmacokinetic properties (II, III).

Journal of Medicinal Chemistry published new progress about Axins Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 876919-08-3 belongs to class pyridine-derivatives, and the molecular formula is C7H6FNO2, Recommanded Product: Methyl 3-fluoroisonicotinate.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Kang, Yan-Shang; Zhang, Ping; Li, Min-Yan; Chen, You-Ke; Xu, Hua-Jin; Zhao, Jing; Sun, Wei-Yin; Yu, Jin-Quan; Lu, Yi published the artcile< Ligand-Promoted RhIII-Catalyzed Thiolation of Benzamides with a Broad Disulfide Scope>, Reference of 2127-03-9, the main research area is benzamide pentafluorophenyl disulfide rhodium amino acid regioselective thiolation catalyst; arylthio pentafluorophenyl benzamide preparation; amino acids; directing groups; disulfides; rhodium; thiolation.

A ligand-promoted RhIII-catalyzed C(sp2)-H activation/thiolation of benzamides has been developed. Using bidentate mono-N-protected amino acid ligands led to the first example of RhIII-catalyzed aryl thiolation reactions directed by weakly coordinating directing amide groups. The reaction tolerates a broad range of amides and disulfide reagents.

Angewandte Chemie, International Edition published new progress about Amino acids Role: CAT (Catalyst Use), USES (Uses). 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Reference of 2127-03-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Tao; Luan, Yu-Xin; Lam, Nelson Y. S.; Li, Jiang-Fei; Li, Yue; Ye, Mengchun; Yu, Jin-Quan published the artcile< A directive Ni catalyst overrides conventional site selectivity in pyridine C-H alkenylation>, Computed Properties of 3796-23-4, the main research area is alkenylated pyridine preparation; alkyne pyridine alkenylation heterocyclic carbene ligated nickel aluminum catalyst.

Herein, application of bifunctional N-heterocyclic carbene-ligated Ni-Al catalyst in C3-H alkenylation of pyridines was described. This method overrode the intrinsic C2 and/or C4 selectivity, and provided a series of C3-alkenylated pyridines such as I in 43-99% yields and up to 98:2 C3 selectivity. This method not only allowed a variety of pyridine and heteroarene substrates to be used as the limiting reagent, but was also effective for the late-stage C3 alkenylation of diverse complex pyridine motifs in bioactive mols.

Nature Chemistry published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Computed Properties of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lopez, Luis A.; Gonzalez, Javier published the artcile< Copper(I)-carbenes as key intermediates in the [3 + 2]-cyclization of pyridine derivatives with alkenyldiazoacetates: a computational study>, Synthetic Route of 93-60-7, the main research area is vinyldiazo acetate pyridine copper bromide catalyst cyclization reaction mechanism.

This work reports a computational study of the copper(I)-catalyzed regioselective synthesis of indolizine derivatives through the [3 + 2]-cyclization reaction of vinyldiazo acetates and pyridine derivatives This reaction is predicted to proceed via a multi-step process with the initial decomposition of the diazo function and generation of an electrophilic copper(I) carbene intermediate. Subsequent attack of the pyridine derivative at the vinylogous position of the carbene would generate a vinylcuprate intermediate that would evolve to the final products through a sequence involving cyclization, reductive elimination, metal decoordination and final oxidative aromatization. According to our calculations, an alternative pathway involving the initial activation of the pyridine seems unlikely. These theor. results could pave the way for further developments in vinyldiazo chem.

Organic & Biomolecular Chemistry published new progress about Cyclization catalysts. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Synthetic Route of 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Dan-Yang; Si, Yubing; Li, Junjie; Fu, Yongzhu published the artcile< Tuning the electrochemical behavior of organodisulfides in rechargeable lithium batteries using N-containing heterocycles>, Electric Literature of 2127-03-9, the main research area is organodisulfide tuning electrochem behavior rechargeable lithium battery.

S-S bonds in organodisulfides can break and obtain Li+ and e- in the discharge of lithium batteries. Organodisulfides provide precise lithiation sites, and therefore are valuable models for the study of redox reactions in lithium batteries. To understand their electrochem. behavior, we investigate three disulfides with different N-containing heterocycles including 2,2′-dipyridyl disulfide (2,2′-DpyDS), 4,4′-dipyridyl disulfide (4,4′-DpyDS), and 2,2′-dipyridyl disulfide-N,N’-dioxide (DpyDSDO). The three disulfides all show higher discharge voltage plateaus due to the electron-withdrawing groups: DPDS (2.20 V) < 2,2'-DpyDS (2.45 V) = 4,4'-DpyDS (2.45 V) < DpyDSDO (2.80 V). In particular, 2,2'-DpyDS exhibits an outstanding 69% capacity retention over 500 cycles. Our theor. simulations show that lithium pyridine-2-thiolate, the discharge product of 2,2'-DpyDS, forms compact clusters via N···Li···S bridges coordinated by lithium ions, which can help reduce its dissolution in liquid electrolyte, and therefore increase the cycle life. Liquid chromatog.-mass spectrometry is demonstrated to be a powerful tool for the investigation of discharge/recharge products of soluble organodisulfides in rechargeable lithium batteries. Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about Battery cathodes. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Electric Literature of 2127-03-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Au-Yeung, Ka-Chun; Xiao, Dengmengfei; Shih, Wei-Chih; Yang, Hsiu-Wen; Wen, Yuh-Sheng; Yap, Glenn P. A.; Chen, Wen-Ching; Zhao, Lili; Ong, Tiow-Gan published the artcile< Carbodicarbene: geminal-Bimetallic Coordination in Selective Manner>, Synthetic Route of 3796-23-4, the main research area is palladium acetate cyclometalation reaction carbodicarbene; carbene palladium trinuclear dinuclear heterobinuclear complex preparation crystal structure; crystal structure trinuclear carbene palladium heterobinuclear gold nickel complex; mol structure trinuclear carbene palladium heterobinuclear gold nickel complex; gold nickel heterobinuclear carbene complex preparation crystal structure; carbodicarbene; carbone; double dative bond; metal-metal interaction; palladium.

The reaction of Pd(OAc)2 with free carbodicarbene (CDC) generates a Pd acetate trinuclear complex 1 via intramol. C(sp3)-H bond activation at one of the CDC Me side arms. The solid structure of 1 reveals the capability of CDC to facilitate a double dative bond with two Pd centers in geminal fashion. This is attributed to the chelating mode of CDC, which can frustrate π-conjugation within the CDC framework. Such effect maybe also amplified by ligand-ligand interaction. The formation of other gem-bimetallic Pd-Pd, Pd-Au, and Ni-Au provides further structural evidence for this proof-of-concept in selective installation. Structural anal. is supported by computational calculations based on state-of-the-art energy decomposition anal. (EDA) in conjunction with natural orbitals for chem. valence (NOCV) method.

Chemistry – A European Journal published new progress about C-H bond activation. 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Synthetic Route of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ungwitayatorn, Jiraporn; Wiwat, Chanpen; Matayatsuk, Chutima; Pimthon, Jutarat; Piyaviriyakul, Suratsawadee published the artcile< Synthesis and HIV-1 reverse transcriptase inhibitory activity of non-nucleoside phthalimide derivatives>, Quality Control of 56622-54-9, the main research area is phthalimide nonnucleoside derivative preparation HIV1 reverse transcriptase inhibitory activity.

A new type of non-nucleoside HIV-1 reverse transcriptase inhibitor in the phthalimide series has been synthesized from either the reaction of N-carboethoxyphthalimide with amines or phthalimide with appropriate alkyl halides. The in vitro inhibitory activity of the synthesized compounds was studied by a radiometric assay at a concentration of 200 μg/mL using poly(rA)•oligo(dT) as a template-primer and methyl-[3H]dTTP as a substrate. The three most potent compounds, I-III, exhibited IC50 values of 60.90, 98.10 and 120.75 μg/mL, resp., lower than the IC50 of delavirdine (502.22 μg/mL, using poly(rA)•oligo(dT) as a template-primer and [3H]dTTP as a substrate).

Chinese Journal of Chemistry published new progress about Cyclic imides Role: PAC (Pharmacological Activity), SPN (Synthetic Preparation), BIOL (Biological Study), PREP (Preparation). 56622-54-9 belongs to class pyridine-derivatives, and the molecular formula is C7H10N2, Quality Control of 56622-54-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Talik, Tadeusz; Talik, Zofia published the artcile< Nitraminopyridines. II. Reactions of nitraminomethylpyridines with phosphorus halides>, Formula: C6H7N3O2, the main research area is nitramino pyridines; pyridines nitramino.

Reactions of 2-(nitramino)pyridines and 4-(nitramino)pyridines with PCl3, PCl5, PBr3, PBr5, and PI3 were studied. The nitramino group was easily exchanged for Cl, Br, or iodine. A series of chloro-, bromo-, and iodopicolines was prepared The following pyridine homologs were used as the starting material: 2-(nitramino)-3-methylpyridine (I), 2-(nitramino)-4-methylpyridine (II), 2-(nitramino)-5-methylpyridine (III), 2-(nitramino)-6-methylpyridine (IV), 4-(nitramino)-3-methylpyridine (V), 4-(nitramino)-2-methylpyridine (VI), 4-(nitramino)-2,6-dimethylpyridine (VII), and 3-(nitramino)-2,6-dimethylpyridine (VIII). The reactions were carried out in CHCl3 with 0.5 mole excess phosphorous halide at the boiling temperature Thus, a suspension of 0.01 mole nitraminomethylpyridine in 10 ml. CHCl3 was treated, under cooling, with 2.1 g. PCl3 then refluxed 1 hr., concentrated in vacuo, decomposed with ice, neutralized with NaHCO3 and steam distilled When extracted with Et2O, and the extract worked up, the distillate gave a halopicoline. The following compounds were reported (substrate, phosphones halide, product, m.p., b.p., and % yield given): I, PCl3, 2-chloro-3-methylpyridine, -, 193°, 24.1, and 2-chloro-5-nitro-3-methylpyridine (IX) 48°, -, 11.5; II, PCl3, 2-chloro-4-methylpyridine (X), -, 194°, 72.3; III, PCl3, 2-chloro-5-methylpyridine (XI), -, 86-7°/15 mm., 60.2; IV, PCl3, 2-chloro-5-nitro-6-methylpyridine (XII), 52°, -, 11.7, and 2-amino-3-nitro-6-methylpyridine (XIII), 141°, -, 6.7, and 2-amino-5-nitro-6methylpyridine, 188°, -, 13.3; V, PCl3, 4-chloro-3-methylpyridine (XIV), -, 164°, 60.2; VI, PCl3, 4-chloro-2-methylpyridine (XV), -, 162°, 72.3; VII, PCl3, 4-chloro-2,6-dimethylpyridine (XVI), -, 177°, 86.5; I, PCl5, IX, 47°, -, 26.6, and 2-amino-5-nitro-3-methylpyridine, 254°, -, 60.2; II, PCl5, X, -, 194°, 60.2; III, PCl5, XI, -, 87°/15 mm., 56.2; IV, PCl5, XII, 52°, -, 41.2, and XIII, 141°, -, 46.7; V, PCl5, XIV, -, 164°, 84.3; VI, PCl5, XV, -, 162°, 84.3; VII, PCl5, XVI, -, 177°, 86.5; I, PBr3, 2-bromo-3-methylpyridine (XVII), -, 209°, 48.5; II, PBr3, 2-bromo-4-methylpyridine (XVIII), -, 213°, 63.6, III, PBr3, 2-bromo-5-methylpyridine (XIX), 48°, -, 62.3; IV, PBr3, 2-bromo-5-nitro-6-methylpyridine (XX), 69°, -, 32.8, and 2-amino-3-nitro-6-methylpyridine (XXI), 141°, -, 20, and 2-amino-5-nitro-6-methylpyridine (XXII), 188°, -, 40; V, PBr3, PBr3, 4-bromo-3-methylpyridine (XXIII), -, 76°/15 mm., 77.1; VI, PBr3, 4-bromo-2-methylpyridine (XXIV), -, 181°, 62.3; VII, PBr3, 4-bromo-2,6-dimethylpyridine (XXV), -, 193°, 49.4; I, PBr5, XVII, -, 209°, 71.2; II, PBr5, XVIII, -, 212°, 62.3; III, PBr5, XIX, 48°, -, 62.3; IV, PBr5, XX, 69°, -, 9.4, and XXI, 141°, -, 33.3, and XXII, 188°, -, 40.0; V, PBr5, XXIII, -, 76°/15 mm., 44.5; VI, PBr5, XXIV, -, 181°, 44.5; VII, PBr5, XXV, -, 193°, 49.4; I, PI3, 2-iodo-3-methylpyridine, -, 105°, 27; II, PI3, 2-iodo-4-methylpyridine, -, 112°, 65; III, PI3, 2-iodo-5-methylpyridine, 52°, -, 69.9; V, PI3, 4-iodo-3-methylpyridine, 46°, -, 55.9; VI, PI3, 4-iodo-2-methylpyridine, 42°, -, 83.6; VII, PI3, 4-iodo-2,6-dimethylpyridine, 99°, -, 65.7. VIII did not react with phosphorus halides. Under the conditions employed, decomposition of VIII and formation of 3-amino-2,6-dimethylpyridine was observed.

Roczniki Chemii published new progress about Group 15 element halides, phosphorus halides Role: RCT (Reactant), RACT (Reactant or Reagent). 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Formula: C6H7N3O2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ebrahimi, Mahmoud; Es’haghi, Zarrin; Samadi, Fatemeh; Bamoharram, Fatemeh Farrash; Hosseini, Mohammad-Saeid published the artcile< Rational design of heteropolyacid-based nanosorbent for hollow fiber solid phase microextraction of organophosphorus residues in hair samples>, Name: 4-(Pyridin-1-ium-1-yl)butane-1-sulfonate, the main research area is organophosphorus pesticide microextraction human hair ionic liquid.

A novel heteropolyacid-based supported ionic liquid (IL) mediated sol-gel hybrid organic-inorganic is presented for effective use in hollow fiber solid phase microextraction (HF-SPME). The authors examined a Keggin-based IL that was evaluated in conjunction with sol-gel. This study shows that Keggin-based IL sol-gel generated porous morphol. pro effective extraction media. The method was developed for the extraction of the organophosphorus pesticides (OPs); diazinon, fenitrothion and malathion from human hair samples. The OPs were subsequently analyzed with HPLC and photodiode array detection (HPLC-PDA). In the basic condition (pH 10-11), the gel growth process in the presence of IL was initiated. Afterward, this sol was injected into a polypropylene hollow fiber segment for in situ-gelation process. Parameters affecting the efficiency of HF-SPME were thoroughly investigated. Linearity was observed over a range of 0.02-50,000 μg/g and 0.0001-25,000 ng/mL with detection limits between 0.0074-1.3000 μg/g and 0.00034-0.84 ng/mL for the OPs in hair and aqueous matrixes, resp. The relative recoveries in the real samples, for OPs in the storekeeper hair ranged from 86 to 95.2%.

Journal of Chromatography A published new progress about Hair. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Name: 4-(Pyridin-1-ium-1-yl)butane-1-sulfonate.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem