Category: Pyrazines

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 118994-89-1, is researched, SMILESS is O=C(C1=CN=CO1)OCC, Molecular C6H7NO3Journal, Tetrahedron Letters called A general route to the Streptomyces-derived inthomycin family: the first synthesis of (+)-inthomycin B, Author is Webb, Michael R.; Donald, Craig; Taylor, Richard J. K., the main research direction is asym synthesis inthomycin B Stille coupling palladium catalyst; Stille coupling stannyl diene oxazole vinyl iodide; Kiyooka ketene acetal amino acid derived oxazaborolidinone directed aldol.SDS of cas: 118994-89-1.

A concise, convergent and stereocontrolled synthesis of (+)-inthomycin B (I), based on the Stille coupling of a stannyl-diene with an oxazole vinyl iodide unit, is described. The asym. center was introduced using the Kiyooka ketene acetal/amino acid-derived oxazaborolidinone procedure.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Zanaletti, Riccardo; Bettinetti, Laura; Castaldo, Cristiana; Cocconcelli, Giuseppe; Comery, Thomas; Dunlop, John; Gaviraghi, Giovanni; Ghiron, Chiara; Haydar, Simon N.; Jow, Flora; Maccari, Laura; Micco, Iolanda; Nencini, Arianna; Scali, Carla; Turlizzi, Elisa; Valacchi, Michela researched the compound: 3-(Pyridin-4-yl)-1H-pyrazol-5-amine( cas:91912-53-7 ).Application In Synthesis of 3-(Pyridin-4-yl)-1H-pyrazol-5-amine.They published the article 《Discovery of a novel alpha-7 nicotinic acetylcholine receptor agonist series and characterization of the potent, selective, and orally efficacious agonist 5-(4-Acetyl[1,4]diazepan-1-yl)pentanoic acid [5-(4-Methoxyphenyl)-1H-pyrazol-3-yl] amide (SEN15924, WAY-361789)》 about this compound( cas:91912-53-7 ) in Journal of Medicinal Chemistry. Keywords: acetyldiazepanyl pentanoic acid methoxyphenyl pyrazolyl amide synthesis cholinergic agonist; nicotinic acetylcholine receptor agonist discovery structure activity mol docking. We’ll tell you more about this compound (cas:91912-53-7).

Alpha-7 nicotinic acetylcholine receptors (α7 nAChR) are implicated in the modulation of many cognitive functions such as attention, working memory, and episodic memory. For this reason, α7 nAChR agonists represent promising therapeutic candidates for the treatment of cognitive impairment associated with Alzheimer’s disease (AD) and schizophrenia. A medicinal chem. effort, around our previously reported chem. series, permitted the discovery of a novel class of α7 nAChR agonists with improved selectivity, in particular against the α3 receptor subtype and better ADME profile. The exploration of this series led to the identification of 5-(4-acetyl[1,4]diazepan-1-yl)pentanoic acid [5-(4-methoxyphenyl)-1H-pyrazol-3-yl] amide [(I), SEN15924, WAY-361789], a novel, full agonist of the α7 nAChR that was evaluated in vitro and in vivo. Compound I proved to be potent and selective, and it demonstrated a fair pharmacokinetic profile accompanied by efficacy in rodent behavioral cognition models (novel object recognition and auditory sensory gating).

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Formula: C5H5FN2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 5-Amino-2-fluoropyridine, is researched, Molecular C5H5FN2, CAS is 1827-27-6, about Synthesis and in vitro evaluation of [18F]BMS-754807: A potential PET ligand for IGF-1R. Author is Majo, Vattoly J.; Arango, Victoria; Simpson, Norman R.; Prabhakaran, Jaya; Kassir, Suham A.; Underwood, Mark D.; Bakalian, Mihran; Canoll, Peter; John Mann, J.; Dileep Kumar, J. S..

Radiosynthesis and in vitro evaluation of [18F](S)-1-(4-((5-cyclopropyl-1H-pyrazol-3-yl)amino)pyrrolo[2,1-f][1,2,4]triazin-2-yl)-N-(6-fluoropyridin-3-yl)-2-methylpyrrolidine-2-carboxamide ([18F]BMS-754807 or [18F] I) a specific IGF-1R inhibitor was performed. [18F]I demonstrated specific binding in vitro to human cancer tissues. Synthesis of reference standard II(X= F) and corresponding bromo derivative II(X = X = Br), the precursor for radiolabeling were achieved from 2,4-dichloropyrrolo[2,1-f][1,2,4]triazine in three steps with 50% overall yield. The radioproduct was obtained in 8% yield by reacting 1a with [18F]TBAF in DMSO at 170 °C at high radiochem. purity and specific activity (1-2 Ci/μmol, N = 10). The proof of concept of IGF-IR imaging with [18F]I was demonstrated by in vitro autoradiog. studies using pathol. identified surgically removed grade IV glioblastoma, breast cancer and pancreatic tumor tissues. These studies indicate that [18F]I can be a potential PET tracer for monitoring IGF-1R.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Yang, Ke; Zhang, Cheng; Wang, Peng; Zhang, Yan; Ge, Haibo published an article about the compound: Ethyl oxazole-5-carboxylate( cas:118994-89-1,SMILESS:O=C(C1=CN=CO1)OCC ).Formula: C6H7NO3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:118994-89-1) through the article.

Nickel-catalyzed ligand-free decarboxylative cross-coupling of azole derivatives with α-oxoglyoxylic acids was developed. This work represents the first example of decarboxylative cross-coupling reactions, in a C-H bond functionalization manner, through nickel catalysis, and tolerates various functional groups. Addnl., this approach provides an efficient access to (ox)azole ketones, an important structural motif in many medicinal compounds with a broad range of biol. activities. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Osano, Mana; Jhaveri, Dishit P.; Wipf, Peter researched the compound: Ethyl oxazole-5-carboxylate( cas:118994-89-1 ).Category: pyrazines.They published the article 《Formation of 6-Azaindoles by Intramolecular Diels-Alder Reaction of Oxazoles and Total Synthesis of Marinoquinoline A》 about this compound( cas:118994-89-1 ) in Organic Letters. Keywords: marinoquinoline total synthesis. We’ll tell you more about this compound (cas:118994-89-1).

A new variant of the intramol. Diels-Alder oxazole (IMDAO) cycloaddition that provides direct access to 6-azaindoles was developed. The IMDAO reaction was applied in a total synthesis of the aminophenylpyrrole-derived alkaloid marinoquinoline A, also featuring the use of a Curtius reaction for preparation of a 5-aminooxazole, a propargylic C,H-bond insertion, an in situ alkyne-allene isomerization, and a ruthenium-catalyzed cycloisomerization for benzene ring annulation to the 6-azaindole.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Yu, Ming; Lizarzaburu, Mike; Motani, Alykhan; Fu, Zice; Du, Xiaohui; Liu, Jiwen; Jiao, Xianyun; Lai, SuJen; Fan, Peter; Fu, Angela; Liu, Qingxiang; Murakoshi, Michiko; Nara, Futoshi; Oda, Kozo; Okuyama, Ryo; Reagan, Jeff D.; Watanabe, Nobuaki; Yamazaki, Mami; Xiong, Yumei; Zhang, Ying; Zhuang, Run; Lin, Daniel C.-H.; Houze, Jonathan B.; Medina, Julio C.; Li, Leping published the article 《Aminopyrazole-Phenylalanine Based GPR142 Agonists: Discovery of Tool Compound and in Vivo Efficacy Studies》. Keywords: amrinone phenylalanine carboxylic acid preparation GPR142 agonist structure design; pharmacokinetics bioavailability diabetes amrinone phenylalanine carboxylic acid antidiabetic prodrug; glucose tolerance insulin secretagogue human islet transplant CYP450 hERG; GPR142 agonist; aminopyrazole−phenylalanine; human islet transplant; insulin secretagogue; oral glucose tolerance test; prodrug; type 2 diabetes.They researched the compound: 3-(Pyridin-4-yl)-1H-pyrazol-5-amine( cas:91912-53-7 ).Reference of 3-(Pyridin-4-yl)-1H-pyrazol-5-amine. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:91912-53-7) here.

Herein, we report the lead optimization of amrinone-phenylalanine based GPR142 agonists. Structure-activity relationship studies led to the discovery of aminopyrazole-phenylalanine carboxylic acid I, which exhibited good agonistic activity, high target selectivity, desirable pharmacokinetic properties, and no cytochrome P 450 or hERG liability. Compound I, together with its orally bioavailable Et ester prodrug II, were found to be suitable for in vivo proof-of-concept studies. Compound II displayed good efficacy in a mouse oral glucose tolerance test (OGTT). CompoundI showed GPR142 dependent stimulation of insulin secretion in isolated mouse islets and demonstrated a statistically significant glucose lowering effect in a mouse model bearing transplanted human islets.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Palladium-Catalyzed Hydroxycarbonylation of (Hetero)aryl Halides for DNA-Encoded Chemical Library Synthesis, published in 2019-08-21, which mentions a compound: 591-54-8, mainly applied to palladium catalyzed hydroxycarbonylation heteroaryl halide DNA encoded library synthesis, HPLC of Formula: 591-54-8.

A strategy for DNA-compatible, palladium-catalyzed hydroxycarbonylation of (hetero)aryl halides on DNA-chem. conjugates has been developed. This method generally provided the corresponding carboxylic acids in moderate to very good conversions for (hetero)aryl iodides and bromides, and in poor to moderate conversions for (hetero)aryl chlorides. These conditions were further validated by application within a DNA-encoded chem. library synthesis and subsequent discovery of enriched features from the library in selection experiments against two protein targets.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Giebultowicz, Joanna; Sobiech, Monika; Ruzycka, Monika; Lulinski, Piotr published an article about the compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid( cas:2150-55-2,SMILESS:O=C(C1N=C(N)SC1)O ).Computed Properties of C4H6N2O2S. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:2150-55-2) through the article.

The authors proposed an innovative hydrophilic interaction dispersive solid-phase extraction (HI-d-SPE) protocol suitable for the isolation of the potential cyanide intoxication marker, 2-aminothiazoline-4-carboxylic acid (ATCA), from such complicated matrix as post-mortem blood. To create an optimal HI-d-SPE protocol, two sorbents were used: a molecularly imprinted polymer (MIP) and com. available Oasis-MCX. The latter sorbent was identified as more recovery-efficient with higher clean-up abilities in a carefully optimized process. Computational anal. was employed to provide insight into the adsorption mechanism of the two selected sorbents. The theor. results were in agreement with the experiment regarding the efficiency of the sorbent. HI-d-SPE was successfully applied to the anal. of ATCA in 20 post-mortem blood samples using LC-MS/MS. The anal. performance of the method was finally compared to prior existing methods, in turn revealing its superiority.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Jiang, Yong; Hu, Miao; Sun, Nan; Hu, Baoxiang; Shen, Zhenlu; Hu, Xinquan; Jin, Liqun researched the compound: 4-Aminopyrimidine( cas:591-54-8 ).SDS of cas: 591-54-8.They published the article 《Bidentate geometry-constrained iminopyridyl nickel-catalyzed synthesis of amines or imines via borrowing hydrogen or dehydrogenative condensation》 about this compound( cas:591-54-8 ) in Tetrahedron Letters. Keywords: secondary amine preparation; primary amine alc iminopyridyl nickel catalyst alkylation; imine preparation; alkyl amine alc iminopyridyl nickel catalyst dehydrogenative coupling reaction; bidentate geometry constrained iminopyridyl nickel catalyst preparation. We’ll tell you more about this compound (cas:591-54-8).

The efficient Ni-catalyzed N-alkylation of various anilines with alcs. via borrowing hydrogen was reported using a bidentate geometry-constrained iminopyridyl nickel complex as the catalyst. Substituted benzylic alcs. and short/long chain aliphatic alcs. could be applied as the alkylation sources to couple with aromatic and heteroaromatic amines to give a diverse set of N-alkylation outcomes in moderate to excellent yields. The nickel catalytic system was also suitable for aliphatic amines, selectively delivering the corresponding imines via an acceptorless dehydrogenative condensation strategy.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Application of 118994-89-1. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Ethyl oxazole-5-carboxylate, is researched, Molecular C6H7NO3, CAS is 118994-89-1, about The Application of C-H Functionalization in the Development of a Concise and Convergent Route to the Phosphatidylinositol-3-kinase Delta Inhibitor Nemiralisib.. Author is Bream, Robert N.; Clark, Hugh; Edney, Dean; Harsanyi, Antal; Hayler, John; Ironmonger, Alan; Mc Cleary, Nadine; Phillips, Natalie; Priestley, Catherine; Roberts, Alastair; Rushworth, Philip; Szeto, Peter; Webb, Michael R.; Wheelhouse, Katherine.

The development of an improved and scalable method for the manufacture of Nemiralisib, a phosphatidylinositol-3-kinase delta inhibitor was studied. Incorporation of three consecutive catalytic reactions, including a palladium-catalyzed C-H functionalization and an iridium-catalyzed borylation, significantly simplified and shortened the synthetic sequence. The revised route was successfully implemented in pilot plant on multikilogram scale to deliver >100 kg of product.

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Reference:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem