Heterocyclic Building Blocks-quinoxaline

1448-87-9, An article , which mentions 1448-87-9, molecular formula is C8H5ClN2. The compound – 2-Chloroquinoxaline played an important role in people’s production and life.

Photoredox-Catalysed Decarboxylative Alkylation of N-Heteroarenes with N-(Acyloxy)phthalimides

An iridium photoredox catalyst in combination with either a stoichiometric amount of Br¡ãnsted acid or a catalytic amount of Lewis acid is capable of catalyzing regioselective alkylation of N-heteroarenes with N-(acyloxy)phthalimides at room temperature under irradiation. A broad range of N-heteroarenes can be alkylated using a variety of secondary, tertiary, and quaternary carboxylates. Mechanistic studies suggest that an IrII/IrIIIredox catalytic cycle is responsible for the observed reactivity.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N552 | ChemSpider

2213-63-0, Name is 2,3-Dichloroquinoxaline, belongs to quinoxaline compound, is a common compound. 2213-63-0In an article, authors is Ashry, E.S.H. El, once mentioned the new application about 2213-63-0.

Microwave Irradiation for Accelerating Organic Reactions – Part II: Six-, Seven-Membered, Spiro, and Fused Heterocycles

The use of microwave irradiation (MWI) as a nonconventional source of energy, a consequence of converting electromagnetic energy, had become very attractive for its applications to chemistry and material processing. In organic synthesis, the potential of microwave (MW) as a tool for heating attracted much interest soon after the work of Gedye (86TL279) and Giguere (86TL4945) in 1986. The terminology for the introduction of MW for organic reaction enhancement (MORE) and/or MW-assisted organic synthesis (MAOS) enabled access or parallel synthesis of various classes of compounds in organic chemistry. Although in the beginning some obstacles were faced by chemists using this technology, their desire led to the development of methods for the concurrent use of MW. One of these achievements involves the performance of organic reactions under solvent-free conditions: dry media in open vessels. Moreover, equipment and reactors have been developed and have become commercially available. Nowadays, MW activations are widely used in organic chemistry as shown by the increased number of publications. Available reviews include (91OPP683, 95AJC1665, 95T10403, 97CSR233, 97MI1, 98CSR213, 98CJC525, 98S1213, 99AJC83, 99JHC1565, 99MI1, 99MI2, 99MI3, 99T10851, 00CSR239, 00MI1, 01MI1, 01MI2, 01T4365, 01T9199, 01T9225, 02ACR717, 02MI1, 02MI2, 02MI3, 02T1235, 03MI1, 03MI2, 04H903, 05AHC1). The rapid expansion and popularity of assisting a wide range of organic reactions by exposure to MW have been accompanied by achieving reactions under solvent-free conditions, reducing reaction times, and increasing the yield of products and even selectivity. Moreover, in addition to the economic impact, there are additional advantages such as the use of noncorrosive, inexpensive, and environment-friendly catalysts, thus leading to eco-friendly approaches known as “green chemistry”. All these have attracted our attention to review the available literature on the role of MW in the field of heterocyclic chemistry, but owing to the increased number of publications led us first to publish “Microwave Irradiation for Accelerating Organic Reactions. Part I: Three, Four and Five Membered Heterocycles” in a former volume (05AHC1). This new chapter will be the second part including six-, seven-membered, spiro, and fused heterocyclic ring systems. Our survey of the literature on the synthesis and reactions of these heterocycles has been divided according to the number of heteroatoms in the heterocycles. The fused heterocycles are located according to the heterocycle that was built under MWI or as a reaction of these heterocycles acting as precursors. Each type is reviewed by first presenting their methods of preparation of the desired ring followed by its reactions. Heterocycles having either fused benzene or other heterocyclic rings have been located under a separate title when enough literature has been reported.

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Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 90272-84-7, C9H7ClN2. A document type is Article, introducing its new discovery., 90272-84-7

Design, synthesis, and biological evaluation of analogues of the antitumor agent, 2-{4-[(7-chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid (XK469)

2-{4-[(7-Chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid (XK469) is among the most highly and broadly active antitumor agents to have been evaluated in our laboratories and is currently scheduled to enter clinical trials in 2001. The mechanism or mechanisms of action of XK469 remain to be elaborated. Accordingly, an effort was initiated to establish a pharmacophore hypothesis to delineate the requirements of the active site, via a comprehensive program of synthesis of analogues of XK469 and evaluation of the effects of structural modification(s) on solid tumor activity. The strategy formulated chose to dissect the two-dimensional parent structure into three regions – I, ring A of quinoxaline; II, the hydroquinone connector linkage; and III, the lactic acid moiety – to determine the resultant in vitro and in vivo effects of chemical alterations in each region. Neither the A-ring unsubstituted nor the B-ring 3-chloro-regioisomer of XK469 showed antitumor activity. The modulating antitumor effect(s) of substituents of differing electronegativities, located at the several sites comprising the A-ring of region I, were next ascertained. Thus, a halogen substituent, located at the 7-position of a 2-{4-[(2-quinoxalinyl)oxy]phenoxy}propionic acid, generated the most highly and broadly active antitumor agents. A methyl, methoxy, or an azido substituent at this site generated a much less active structure, whereas 5-, 6-, 8-chloro-, 6-, 7-nitro, and 7-amino derivatives all proved to be essentially inactive. When the connector linkage (region II) of 1 was changed from that of a hydroquinone to either a resorcinol or a catechol derivative, all antitumor activity was lost. Of the carboxylic acid derivatives of XK469 (region III), i.e., CONH2, CONHCH3, CON(CH3)2, CONHOH, CONHNH2, CN, or CN4H (tetrazole), only the monomethyl- and N,N-dimethylamides proved to be active.

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18671-97-1, Chemistry, like all the natural sciences, begins with the direct observation of nature¡ª in this case, of matter. In a patent£¬patent Assignee is ICI Australia Limited, Which mentioned a new discovery about 18671-97-1, molecular formula is C8H4Cl2N2.

Herbicidal quinoxaline carboxylic acid derivatives

The invention concerns novel compounds of the formula I STR1 The compounds are herbicides and in further embodiments the invention provides processes for the preparation of compounds of formula I, intermediates useful in the preparation of compounds of formula I, herbicidal composition containing as active ingredient a compound of formula I, and processes for severely damaging or killing unwanted plants by applying to the plants or to the growth medium of the plants an effective amount of a compound of formula I.

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2379-56-8, An article , which mentions 2379-56-8, molecular formula is C8H3N3O4. The compound – 6-Nitroquinoxaline-2,3-dione played an important role in people’s production and life.

Lead discovery of quinoxalinediones as an inhibitor of dipeptidyl peptidase-IV (DPP-IV) by high-throughput screening

N-Ureido-quinoxalinedione derivatives have been discovered as leads for a novel series of dipeptidyl peptidase-IV (DPP-IV) inhibitors through high-throughput screening of our chemical library. A brief structure-activity relationship of the compounds was investigated. Among them, entry 5 showed the most potent inhibitory activity. The nitro group in quinoxaline moiety and the aromatic sulfonyl substituted ureido functional group seem to be important to increase the potency dramatically.

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Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 2379-56-8, Name is 6-Nitroquinoxaline-2,3-dione, molecular formula is C8H3N3O4, 2379-56-8, In a Article, authors is Obefami, Craig A.£¬once mentioned of 2379-56-8

Synthesis and Some Reactions of 3-Chloro-2-(cyanomethylene)-1,2-dihydroquinoxalines

2,3-Dichloroquinoxaline and some of its derivatives have been reacted with malononitrile and ethyl cyanoacetate to yield a variety of 3-chloro-2-(cyanomethylene)-1,2-dihydroquinoxaline derivatives. The reaction of 3-chloro-2-(dicyanomethylene)-1,2-dihydroquinoxaline (2e) with pyridine and its methyl derivatives led to the zwitterionic structures 6a-c. The structures of the newly synthesized compounds were assigned by spectroscopic data and elemental analyses.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.2379-56-8. In my other articles, you can also check out more blogs about 2379-56-8

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2213-63-0, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.2213-63-0, Name is 2,3-Dichloroquinoxaline, molecular formula is C8H4Cl2N2. In a Article, authors is Schwartz, Lennart£¬once mentioned of 2213-63-0

Tuning the electronic properties of Fe2(mu-arenedithiolate)(CO)6-n(PMe3)n (n = 0, 2) complexes related to the [Fe-Fe]-hydrogenase active site

Complexes [Fe2(mu-S2Ar)(CO)6] (S2Ar) = benzene-1,2-dithiolate (1a) toluene-3,4-dithiolate (2a), 3,6-dichloro-1,2-benzenedithiolate (3a), quinoxaline-2,3-dithiolate (7a) have been prepared to investigate the electronic effect that different bridging arenedithiolate ligands have on the appended Fe2(CO)6 sites. Dinuclear complexes [Fe2(mu-S2Ar)(CO)4(PMe3)2] (1-3,7)b and mononuclear complexes [Fe(S2Ar)(CO)2(PMe3)2] (1-3,7)c were synthesized from their parent hexacarbonyl complexes (1-3,7)a. IR spectroscopic, crystallographic and electrochemical analyses show that an increase of the electron-withdrawing character (where quinoxaline-2,3-dithiolate > 3,6-dichloro-1,2-benzenedithiolate > 1,2-benzenedithiolate ? toluene-3,4-dithiolate) of the bridging ligand leads to a decreased electron density at the iron centers, which yield a milder reduction potential and higher eCO stretching frequencies. This effect is coherent for all of the investigated complexes. Electrocatalytic proton reduction by complex 3a (with trifluoromethanesulfonic acid) was evidenced by cyclic voltammetry. As a result of the milder reduction potential of 3a itself, proton reduction that is promoted by 3a proceeds at a potential that is milder than that for the 1a-catalyzed process.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 2213-63-0

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6344-72-5, In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 6344-72-5, name is 6-Methylquinoxaline, introducing its new discovery.

BENZOXAZINE DERIVATIVES AS GLYCINE TRANSPORT INHIBITORS

The present invention relates to benzoxazinone derivatives, processes for their preparation, pharmaceutical compositions and medicaments containing them and to their use in treating disorders mediated by Gly T1, including neurological and neuropsychiatric disorders, in particular psychoses, dementia or attention deficit disorder.

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1448-87-9, Name is 2-Chloroquinoxaline, belongs to quinoxaline compound, is a common compound. 1448-87-9In an article, authors is Armengol, Montserrat, once mentioned the new application about 1448-87-9.

Synthesis of thieno[2,3-b]quinoxalines from 2-haloquinoxalines

Thieno[2,3-b]quinoxalines were synthesized from 2-haloquinoxalines using palladium catalyst. The coupling of latter with alkynes and addition of one mol equivalent of bromine to the 2-alkynylquinoxalines thus produced was described. The resulting dibromides reacted with dipotassium trithiocarbonate to produce the desired compound.

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1448-87-9, Name is 2-Chloroquinoxaline, belongs to quinoxaline compound, is a common compound. 1448-87-9In an article, authors is Baranova, Anna A., once mentioned the new application about 1448-87-9.

Synthesis and characterization of linear 1,4-diazine-triphenylamine?based selective chemosensors for recognition of nitroaromatic compounds and aliphatic amines

Novel 1,4-diazine-based dyes of the D?pi?A type, possessing triphenylamine as an electron-donating group, have been developed. Fluorescence studies have demonstrated that emission of these fluorophores is sensitive towards different nitroaromatic compounds and aliphatic amines, both in solutions and in a vapor phase. Moreover, these compounds can be considered as ?naked-eye? fluorescent probes for solution polarity because they possess pronounced solvatochromic properties. Therefore, these compounds have to be regarded as potential multifunctional chemosensors for monitoring hazardous organic substances.

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