Month: February 2023

Azanaphthalenes. I. Hueckel orbital calculations was written by Wait, S. C. Jr.;Wesley, John W.. And the article was included in Journal of Molecular Spectroscopy in 1966.Recommanded Product: 322-46-3 This article mentions the following:

Energy levels, wave functions, and charge ds. are reported for 74 azanaphthalenes. Calculations were performed by using the Hueckel method. Comparison of the lowest singlet-singlet transition with that calculated by the Pariser-Parr method is given for 21 compounds In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3Recommanded Product: 322-46-3).

Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazines are part of several biologically active polycyclic compounds; examples are quinoxalines, phenazines; and the bio-luminescent natural products pteridines, flavins, and their derivatives. Pyrazine heterocycles and their benzo derivatives possess many interesting properties, including chemical reactivity profiles, and have diverse applications in total synthesis, medicine, chemical biology, materials, dyes, and imaging.Recommanded Product: 322-46-3

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Pyrazoles. 6. Synthesis of novel heteroaryl 4-pyrazolyl ketones was written by Hahn, Marianne;Heinisch, gottfried;Holzer, Wolfgang;Schwarz, Helga. And the article was included in Journal of Heterocyclic Chemistry in 1991.Electric Literature of C7H8N2O2 This article mentions the following:

Pyrazolyl ketones I (R = 2-, 3-, 4-pyridinyl, 3-, 4-pyridazinyl, 4-pyrimidinyl, 2-pyrazinyl, 2-, 3-thienyl, 4-bromo-2-thienyl) were prepared by lithiation and condensation of 4-bromopyrazole with RCO₂Et or with RCHO (R = 2-, 3-thienyl, 4-bromo-2-thienyl) followed by oxidation In the experiment, the researchers used many compounds, for example, Ethyl pyrazine-2-carboxylate (cas: 6924-68-1Electric Literature of C7H8N2O2).

Ethyl pyrazine-2-carboxylate (cas: 6924-68-1) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human Granulocytes.Electric Literature of C7H8N2O2

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthesis, characterization, and computational modeling of benzodithiophene donor-acceptor semiconducting polymers was written by Sista, Prakash;Hao, Jing;Elkassih, Sussana;Sheina, Elena E.;Biewer, Michael C.;Janesko, Benjamin G.;Stefan, Mihaela C.. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2011.Synthetic Route of C8H4Br2N2 This article mentions the following:

Donor-acceptor semiconducting polymers containing benzodithiophene with decyl phenylethynyl substituents have been synthesized. D. functional calculations on the polymers’ band gaps and frontier orbitals energies provide reasonable agreement with cyclic voltammetry, photoelectron spectroscopy, and UV-vis absorption measurements. 婕?2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Synthetic Route of C8H4Br2N2).

5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.Synthetic Route of C8H4Br2N2

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Identification of hydroxymethylpyrazines using mass spectrometry was written by Bohman, Bjoern;Flematti, Gavin R.;Barrow, Russell A.. And the article was included in Journal of Mass Spectrometry in 2015.Quality Control of (3,5,6-Trimethylpyrazin-2-yl)methanol This article mentions the following:

Pyrazines are well-known natural products that are present in bacterial odors and food flavoring agents and are used as insect pheromones. Recently, a number of hydroxymethylpyrazines have been identified as thynnine wasp pheromones and orchid semiochems. that are essential for pollination in sexually deceptive plants. These compounds are present in low amounts in complex blends, making GC-MS (including high-resolution techniques) the method of choice for their structure elucidation. We report the EI mass spectra for 14 representative compounds and have found that based on characteristic fragmentations, it is possible to distinguish between different positional isomers of hydroxymethylpyrazines. The presence or absence of either [M – 17]⁺, [M – 18]^{+璺?/sup> or [M – 19]+ fragment species provides characteristic information to allow the distinction between the different isomers. Considering the importance of pyrazines as a group of bioactive natural products, and the recent findings of biol. activity for hydroxymethylpyrazines, our results presented here will aid the identification of these compounds in other biol. systems. Copyright 婕?2015 John Wiley & Sons, Ltd. In the experiment, the researchers used many compounds, for example, (3,5,6-Trimethylpyrazin-2-yl)methanol (cas: 75907-74-3Quality Control of (3,5,6-Trimethylpyrazin-2-yl)methanol).}

(3,5,6-Trimethylpyrazin-2-yl)methanol (cas: 75907-74-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human Granulocytes.Quality Control of (3,5,6-Trimethylpyrazin-2-yl)methanol

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Design, synthesis and biological evaluation of thrombin inhibitors with 1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine nucleus was written by Chen, Dongxing;Shi, Jinyu;Chen, Qiufang;Zhang, Rui;Gong, Guoqing;Xu, Yungen;Zhu, Qihua. And the article was included in Gaodeng Xuexiao Huaxue Xuebao in 2017.HPLC of Formula: 75907-74-3 This article mentions the following:

Compound 1, a new thrombin inhibitor with 1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine nucleus, was selected as lead compound, and fourteen carbamate derivatives derivatives were designed and prepared Furthermore, a twin drug (11) was synthesized by coupling compound 1 with 2-hydroxymethyl-3,5,6-trimethylpyrazine (HTMP). The structures of all the target compounds were confirmed by ¹H-NMR, ¹³C-NMR and HRMS. Preliminary biol. activity test results indicated that all of the tested compounds exhibited a certain degree of inhibitory effect on thrombin-induced platelet aggregation, among which compound 4b [IC₅₀ = (0.11鍗?.08) 娓璵ol/L] showed better anti-platelet aggregation activity than dabigatran etexilate [IC₅₀ = (0.60鍗?.05) 娓璵ol/L]. The in vitro exptl. results in rat venous thrombosis model demonstrated compound 4b could significantly reduce thrombosis in a dose-response manner. Compound 11, which showed weak inhibitory effect on thrombin-induced platelet aggregation, also displayed comparable inhibitory effect on rat venous thrombosis with dabigatran etexilate. The study pointed out that the enhanced potency of compound 11 may be the synergetic effect on HTMP and compound 1 which were generated by hydrolysis in vivo. In the experiment, the researchers used many compounds, for example, (3,5,6-Trimethylpyrazin-2-yl)methanol (cas: 75907-74-3HPLC of Formula: 75907-74-3).

(3,5,6-Trimethylpyrazin-2-yl)methanol (cas: 75907-74-3) belongs to pyrazine derivatives. Pyrazine is an N-heterocyclic moiety, and it can be easily prepared from ethylenediamine and 1,2-diketone, 浼?hydroxyketone, 浼?methyl ketone. A number of pyrazine-based derivatives were used as dyes or fluorescent probes.HPLC of Formula: 75907-74-3

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Self-consistent field molecular orbital calculations of ultraviolet electronic spectra of azanaphthalenes with the variable 灏?approximation was written by Tinland, Bernard. And the article was included in Theoretica Chimica Acta in 1967.Product Details of 322-46-3 This article mentions the following:

The stable crystal field M.O. calculations of uv electronic spectra of 10 azonaphthalenes with the variable 灏?approximation (K. Nishimoto, et al., 1966) are presented. The transition energies and bond lengths of these mols. were calculated and the results are in satisfactory agreement with experiment In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3Product Details of 322-46-3).

Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazine heterocycles and their benzo derivatives possess many interesting properties, including chemical reactivity profiles, and have diverse applications in total synthesis, medicine, chemical biology, materials, dyes, and imaging. Pyrazines are chemical compounds (technically called 閳ユ笗ethoxypyrazines閳? found in grape skin and stems that are responsible for many 閳ユ笀reen閳?flavors in wine. Levels of pyrazines are dependent on viticultural practices, climate, and grape variety.Product Details of 322-46-3

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reaction of 1-ethoxyalylmethylpyrido[2,3-b]pyrazinium bromide with ammonium acetate: synthesis of imidazo[1′,2′:1,2]pyrido[5,6-b]pyrazines was written by Blache, Yves;Gueiffier, Alain;Chavignon, Olivier;Elhakmaoui, Ahmed;Viols, Henry;Teulade, Jean Claude;Milhavet, Jean Claude;Dauphin, Gerard;Chapat, Jean Pierre. And the article was included in Heterocycles in 1994.Recommanded Product: Pyrido[2,3-b]pyrazine This article mentions the following:

The synthesis of some imidazo[1,2′:1,2]pyrido[5,6-b]pyrazines I (R¹ = H, Me, R² = H; R¹ = R² = Me) by treatment of quaternary salts of pyrido[2,3-b]pyrazines II (R³ = H) with ammonium acetate in AcOH media is described. In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3Recommanded Product: Pyrido[2,3-b]pyrazine).

Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazinesare six-membered aromatic heterocyclic organic compounds with two nitrogen atoms at 1,4-positions. Pyrazine is a weaker base (pKb = 13.4) than pyridine (pKb = 8.8), pyrimidine (pKb = 12.7). A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.Recommanded Product: Pyrido[2,3-b]pyrazine

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthesis of organosilicon polymers containing donor-acceptor type 锜?conjugated units and their application to dye-sensitized solar cells was written by Ohshita, Joji;Kangai, Sinji;Yoshida, Hiroto;Kunai, Atsutaka;Kajiwara, Shotaro;Ooyama, Yousuke;Harima, Yutaka. And the article was included in Journal of Organometallic Chemistry in 2007.Reference of 148231-12-3 This article mentions the following:

Novel organosilicon polymers with donor-acceptor type 锜?conjugated units in the backbone were prepared by Stille coupling reaction of bis(tributylstannylthienyl)silanes with diiodoquinoxaline, benzothiadiazole, and benzoselenadiazole. De-halogenative copolymerization of di(bromothienyl)silanes and dibromoquinoxaline which gave the corresponding random copolymer was also studied. Applications of these polymers to dye-sensitized solar cells (DSSCs) were examined and the polymer containing benzoselenadiazole units as the acceptor had the best sensitizer performance. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Reference of 148231-12-3).

5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. Substituted pyrazines have been found as subunits of multiple synthetically constructed therapeutic agents, as well as several natural products.Reference of 148231-12-3

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Stabilizing biochemically important intermediates through metal coordination. 5,8-Bis(trimethylsilyl)-5,8-dihydropteridine and its deaza derivative was written by Bessenbacher, Christian;Kaim, Wolfgang. And the article was included in Journal of Organometallic Chemistry in 1989.Reference of 322-46-3 This article mentions the following:

Reductive trimethylsilylation of pteridine and its deaza derivatives 1,4,6- and 1,4,5-triazanaphthalene and quinoxaline yields the primary reduced forms of these heterocycles, which contain the 1,4-dihydro-1,4-diazine ring with 8 conjugated 锜?electrons as the only low mol. weight products. Although the organometallic substituents stabilize these biochem. important yet normally short-lived dihydro forms and so allow unambiguous characterization by NMR, the non-crystalline, colored compounds are still highly reactive. Unexpectedly, the deaza derivatives prove to be less electron-rich than the silylated dihydropteridine despite a clear increase in the electron d. in the aromatic ring. The characteristic conformational flexibility of these intermediates is responsible for this inverse annulation effect. Reductive trimethylsilylation of 1,5-naphthyridine yields the 1-trimethylsilyl-1,4-dihydro derivative as the major product. In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3Reference of 322-46-3).

Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazine derivatives have antitumor, antibiotic, anticonvulsant, antituberculous and diuretic effects as well as kinase, enzymatic and potent tubulin and FtsZ polymerization inhibitory activities. Substituted pyrazines have been found as subunits of multiple synthetically constructed therapeutic agents, as well as several natural products.Reference of 322-46-3

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthesis and spectroscopic study of three new oxadiazole derivatives with detailed computational evaluation of their reactivity and pharmaceutical potential was written by Mary, Y. Sheena;Miniyar, Pankaj B.;Mary, Y. Shyma;Resmi, K. S.;Panicker, C. Yohannan;Armakovic, Stevan;Armakovic, Sanja J.;Thomas, Renjith;Sureshkumar, B.. And the article was included in Journal of Molecular Structure in 2018.Synthetic Route of C7H8N2O2 This article mentions the following:

Local reactivity properties and potential for application in new pharmaceutical compounds have been addressed for the three newly synthesized oxadiazole derivatives 2-(5-(2-nitrophenyl)-1,3,4-oxadiazol-2-yl)pyrazine (ORTHONITRO), 2-(5-(3-nitrophenyl)-1,3,4-oxadiazol-2-yl)pyrazine (METANITRO) and 2-(5-(4-nitrophenyl)-1,3,4-oxadiazol-2-yl)pyrazine (PARANITRO), by application of computational mol. modeling. Within the framework of d. functional theory (DFT) this study encompassed calculations of mol. electrostatic potential (MEP), average local ionization energies (ALIE) and bond dissociation energies for hydrogen abstraction (H-BDE). MD simulations have been used in order to assess the influence of water and to identify the atoms of these mols. with preference towards the interaction with water mols. Mol. docking procedure has been applied in order to check the binding activity of these derivatives against the Glucan endo-1.6-beta-glucosidase inhibitor, Acrocylindropepsin inhibitor and Chymosin inhibitor proteins. The pharmaceutical potential of these derivatives has been assessed by the calculations of the well-established drug likeness parameters. A strong out-of-plane CH mode of the Ph rings are observed at 769 cm^-1 for ORTHONITRO, 768 cm^-1 for METANITRO and at 848 cm^-1 for PARANITRO in the IR spectrum as expected for substituted benzenes. The VCD signals, corresponding to C=N and NO₂ modes of the title compounds are good markers for assigning of absolute configuration. In the title compounds, in ORTHONITRO, the oxadiazole ring is tilted from the Ph and pyrazine ring while for METANITRO and PARANITRO, there is a planar orientation. The first hyperpolariazabilities of ORTHONITRO, METANITRO and PARANITRO are resp., 34.83, 54.50 and 174.05 times that of urea. For all the compounds, HOMO is delocalized over the pyrazine and oxadiazole rings, while LUMO is delocalized over whole mol., except pyrazine ring of ORTHONITRO, over Ph ring and NO₂ group of METANITRO and in the entire mol. of PARANITRO. The title compounds are docked with the proteins, Glucan endo-1.6-beta-glucosidase inhibitor, Acrocylindropepsin inhibitor and Chymosin inhibitor and METANITRO exhibits more inhibitory activity against the receptors than the other ligands. The results obtained from anti-TB activity are more promising as the compounds were found to be more potent than reference standard, ORTHONITRO (MIC = 1.6 娓璯/mL), METANITRO (MIC = 0.8 娓璯/mL), PARANITRO (MIC = 1.6 娓璯/mL), streptomycin (MIC = 6.2 娓璯/mL) and pyrazinamide (MIC = 3.1 娓璯/mL). In the experiment, the researchers used many compounds, for example, Ethyl pyrazine-2-carboxylate (cas: 6924-68-1Synthetic Route of C7H8N2O2).

Ethyl pyrazine-2-carboxylate (cas: 6924-68-1) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.Synthetic Route of C7H8N2O2

Referemce:
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem